[test] Fix resource regexp for Android

The regexp for finding resources to be pushed to Android devices was
too lax. On empty strings it tried to check for more resources on a
directory and hung.

The last test262 roll contains tests with empty imports that started
hanging in this way.

TBR=neis@chromium.org
NOTRY=true

Bug: v8:7834
Change-Id: Ie58f1b18bdd99b7b40c1fb39b25e2f481932e0f3
Reviewed-on: https://chromium-review.googlesource.com/c/1270579Reviewed-by: Georg Neis <neis@chromium.org>
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#56465}

tools/testrunner/objects/testcase.py

@@ -43,15 +43,15 @@ RESOURCES_PATTERN = re.compile(r"//\s+Resources:(.*)")
 # Pattern to auto-detect files to push on Android for statements like:
 # load("path/to/file.js")
 LOAD_PATTERN = re.compile(
-    r"(?:load|readbuffer|read)\((?:'|\")([^'\"]*)(?:'|\")\)")
+    r"(?:load|readbuffer|read)\((?:'|\")([^'\"]+)(?:'|\")\)")
 # Pattern to auto-detect files to push on Android for statements like:
 # import "path/to/file.js"
 MODULE_RESOURCES_PATTERN_1 = re.compile(
-    r"(?:import|export)(?:\(| )(?:'|\")([^'\"]*)(?:'|\")")
+    r"(?:import|export)(?:\(| )(?:'|\")([^'\"]+)(?:'|\")")
 # Pattern to auto-detect files to push on Android for statements like:
 # import foobar from "path/to/file.js"
 MODULE_RESOURCES_PATTERN_2 = re.compile(
-    r"(?:import|export).*from (?:'|\")([^'\"]*)(?:'|\")")
+    r"(?:import|export).*from (?:'|\")([^'\"]+)(?:'|\")")
 
 
 class TestCase(object):