[wasm] fix source maps for relative path

For wasm modules with non-absolute sourceMappingURL, the source needs
to be empty so that devtools can look for the source map at the origin
of the module.

R=clemensh@chromium.org,adamk@chromium.org

Cq-Include-Trybots: luci.chromium.try:linux_chromium_headless_rel;master.tryserver.blink:linux_trusty_blink_rel
Change-Id: I74c40addc1a7cb1be0442e9f2b272590c0b81f60
Reviewed-on: https://chromium-review.googlesource.com/1250402
Commit-Queue: Aseem Garg <aseemgarg@chromium.org>
Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#56326}

src/wasm/module-compiler.cc

@@ -3091,12 +3091,6 @@ Handle<Script> CreateWasmScript(Isolate* isolate,
 
   const int kBufferSize = 32;
   char buffer[kBufferSize];
-  int url_chars = SNPrintF(ArrayVector(buffer), "wasm://wasm/%08x", hash);
-  DCHECK(url_chars >= 0 && url_chars < kBufferSize);
-  MaybeHandle<String> url_str = isolate->factory()->NewStringFromOneByte(
-      Vector<const uint8_t>(reinterpret_cast<uint8_t*>(buffer), url_chars),
-      TENURED);
-  script->set_source_url(*url_str.ToHandleChecked());
 
   int name_chars = SNPrintF(ArrayVector(buffer), "wasm-%08x", hash);
   DCHECK(name_chars >= 0 && name_chars < kBufferSize);

test/inspector/debugger/wasm-stepping-with-source-map-expected.txt

 Tests stepping through wasm scripts with source maps
 Installing code an global variable and instantiate.
-Got wasm script: wasm://wasm/9b4bf87e
+Got wasm script: wasm-9b4bf87e
 Script sourceMapURL: abc
-Requesting source for wasm://wasm/9b4bf87e...
+Requesting source for wasm-9b4bf87e...
 Source retrieved without error: true
-Setting breakpoint on offset 54 (on the setlocal before the call), url wasm://wasm/9b4bf87e
+Setting breakpoint on offset 54 (on the setlocal before the call), url wasm-9b4bf87e
 {
     columnNumber : 54
     lineNumber : 0
     scriptId : <scriptId>
 }
-Paused at wasm://wasm/9b4bf87e:0:54
+Paused at wasm-9b4bf87e:0:54
 at wasm_B (0:54):
  - scope (global):
    -- skipped
@@ -21,7 +21,7 @@ at (anonymous) (0:17):
  - scope (global):
    -- skipped
 Debugger.stepInto called
-Paused at wasm://wasm/9b4bf87e:0:56
+Paused at wasm-9b4bf87e:0:56
 at wasm_B (0:56):
  - scope (global):
    -- skipped
@@ -32,7 +32,7 @@ at (anonymous) (0:17):
  - scope (global):
    -- skipped
 Debugger.stepInto called
-Paused at wasm://wasm/9b4bf87e:0:38
+Paused at wasm-9b4bf87e:0:38
 at wasm_A (0:38):
  - scope (global):
    -- skipped
@@ -48,7 +48,7 @@ at (anonymous) (0:17):
  - scope (global):
    -- skipped
 Debugger.stepOver called
-Paused at wasm://wasm/9b4bf87e:0:39
+Paused at wasm-9b4bf87e:0:39
 at wasm_A (0:39):
  - scope (global):
    -- skipped
@@ -64,7 +64,7 @@ at (anonymous) (0:17):
  - scope (global):
    -- skipped
 Debugger.stepOut called
-Paused at wasm://wasm/9b4bf87e:0:58
+Paused at wasm-9b4bf87e:0:58
 at wasm_B (0:58):
  - scope (global):
    -- skipped
@@ -75,7 +75,7 @@ at (anonymous) (0:17):
  - scope (global):
    -- skipped
 Debugger.stepOut called
-Paused at wasm://wasm/9b4bf87e:0:54
+Paused at wasm-9b4bf87e:0:54
 at wasm_B (0:54):
  - scope (global):
    -- skipped
@@ -86,7 +86,7 @@ at (anonymous) (0:17):
  - scope (global):
    -- skipped
 Debugger.stepOver called
-Paused at wasm://wasm/9b4bf87e:0:56
+Paused at wasm-9b4bf87e:0:56
 at wasm_B (0:56):
  - scope (global):
    -- skipped
@@ -97,7 +97,7 @@ at (anonymous) (0:17):
  - scope (global):
    -- skipped
 Debugger.stepOver called
-Paused at wasm://wasm/9b4bf87e:0:58
+Paused at wasm-9b4bf87e:0:58
 at wasm_B (0:58):
  - scope (global):
    -- skipped
@@ -108,7 +108,7 @@ at (anonymous) (0:17):
  - scope (global):
    -- skipped
 Debugger.resume called
-Paused at wasm://wasm/9b4bf87e:0:54
+Paused at wasm-9b4bf87e:0:54
 at wasm_B (0:54):
  - scope (global):
    -- skipped
@@ -119,7 +119,7 @@ at (anonymous) (0:17):
  - scope (global):
    -- skipped
 Debugger.stepInto called
-Paused at wasm://wasm/9b4bf87e:0:56
+Paused at wasm-9b4bf87e:0:56
 at wasm_B (0:56):
  - scope (global):
    -- skipped
@@ -130,7 +130,7 @@ at (anonymous) (0:17):
  - scope (global):
    -- skipped
 Debugger.stepInto called
-Paused at wasm://wasm/9b4bf87e:0:38
+Paused at wasm-9b4bf87e:0:38
 at wasm_A (0:38):
  - scope (global):
    -- skipped
@@ -146,7 +146,7 @@ at (anonymous) (0:17):
  - scope (global):
    -- skipped
 Debugger.stepOut called
-Paused at wasm://wasm/9b4bf87e:0:58
+Paused at wasm-9b4bf87e:0:58
 at wasm_B (0:58):
  - scope (global):
    -- skipped
@@ -157,7 +157,7 @@ at (anonymous) (0:17):
  - scope (global):
    -- skipped
 Debugger.stepInto called
-Paused at wasm://wasm/9b4bf87e:0:43
+Paused at wasm-9b4bf87e:0:43
 at wasm_B (0:43):
  - scope (global):
    -- skipped
@@ -168,7 +168,7 @@ at (anonymous) (0:17):
  - scope (global):
    -- skipped
 Debugger.stepInto called
-Paused at wasm://wasm/9b4bf87e:0:45
+Paused at wasm-9b4bf87e:0:45
 at wasm_B (0:45):
  - scope (global):
    -- skipped
@@ -179,7 +179,7 @@ at (anonymous) (0:17):
  - scope (global):
    -- skipped
 Debugger.stepInto called
-Paused at wasm://wasm/9b4bf87e:0:47
+Paused at wasm-9b4bf87e:0:47
 at wasm_B (0:47):
  - scope (global):
    -- skipped
@@ -190,7 +190,7 @@ at (anonymous) (0:17):
  - scope (global):
    -- skipped
 Debugger.stepInto called
-Paused at wasm://wasm/9b4bf87e:0:49
+Paused at wasm-9b4bf87e:0:49
 at wasm_B (0:49):
  - scope (global):
    -- skipped
@@ -201,7 +201,7 @@ at (anonymous) (0:17):
  - scope (global):
    -- skipped
 Debugger.stepInto called
-Paused at wasm://wasm/9b4bf87e:0:51
+Paused at wasm-9b4bf87e:0:51
 at wasm_B (0:51):
  - scope (global):
    -- skipped
@@ -212,7 +212,7 @@ at (anonymous) (0:17):
  - scope (global):
    -- skipped
 Debugger.stepInto called
-Paused at wasm://wasm/9b4bf87e:0:53
+Paused at wasm-9b4bf87e:0:53
 at wasm_B (0:53):
  - scope (global):
    -- skipped
@@ -223,7 +223,7 @@ at (anonymous) (0:17):
  - scope (global):
    -- skipped
 Debugger.stepInto called
-Paused at wasm://wasm/9b4bf87e:0:54
+Paused at wasm-9b4bf87e:0:54
 at wasm_B (0:54):
  - scope (global):
    -- skipped
@@ -234,7 +234,7 @@ at (anonymous) (0:17):
  - scope (global):
    -- skipped
 Debugger.stepInto called
-Paused at wasm://wasm/9b4bf87e:0:56
+Paused at wasm-9b4bf87e:0:56
 at wasm_B (0:56):
  - scope (global):
    -- skipped
@@ -245,7 +245,7 @@ at (anonymous) (0:17):
  - scope (global):
    -- skipped
 Debugger.stepInto called
-Paused at wasm://wasm/9b4bf87e:0:38
+Paused at wasm-9b4bf87e:0:38
 at wasm_A (0:38):
  - scope (global):
    -- skipped
@@ -261,7 +261,7 @@ at (anonymous) (0:17):
  - scope (global):
    -- skipped
 Debugger.stepInto called
-Paused at wasm://wasm/9b4bf87e:0:39
+Paused at wasm-9b4bf87e:0:39
 at wasm_A (0:39):
  - scope (global):
    -- skipped
@@ -277,7 +277,7 @@ at (anonymous) (0:17):
  - scope (global):
    -- skipped
 Debugger.stepInto called
-Paused at wasm://wasm/9b4bf87e:0:40
+Paused at wasm-9b4bf87e:0:40
 at wasm_A (0:40):
  - scope (global):
    -- skipped
@@ -293,7 +293,7 @@ at (anonymous) (0:17):
  - scope (global):
    -- skipped
 Debugger.stepInto called
-Paused at wasm://wasm/9b4bf87e:0:58
+Paused at wasm-9b4bf87e:0:58
 at wasm_B (0:58):
  - scope (global):
    -- skipped