[gn] Switch android bots to gn

Also roll build and android_tools, which contains a bump of
the ndk to r12b.

BUG=chromium:629806

Review-Url: https://codereview.chromium.org/2320843003
Cr-Commit-Position: refs/heads/master@{#39269}

DEPS

@@ -8,7 +8,7 @@ vars = {
 
 deps = {
   "v8/build":
-    Var("git_url") + "/chromium/src/build.git" + "@" + "464a8fa0e414f18a55f20f2a6981778f105060da",
+    Var("git_url") + "/chromium/src/build.git" + "@" + "166aec3a7c2d01ac60a4921a494f9c9139454243",
   "v8/tools/gyp":
     Var("git_url") + "/external/gyp.git" + "@" + "702ac58e477214c635d9b541932e75a95d349352",
   "v8/third_party/icu":
@@ -47,7 +47,7 @@ deps = {
 deps_os = {
   "android": {
     "v8/third_party/android_tools":
-      Var("git_url") + "/android_tools.git" + "@" + "af1c5a4cd6329ccdcf8c2bc93d9eea02f9d74869",
+      Var("git_url") + "/android_tools.git" + "@" + "25d57ead05d3dfef26e9c19b13ed10b0a69829cf",
   },
   "win": {
     "v8/third_party/cygwin":

gypfiles/standalone.gypi

@@ -320,7 +320,7 @@
             'android_ndk_root%': '<(base_dir)/third_party/android_tools/ndk/',
             'android_host_arch%': "<!(uname -m | sed -e 's/i[3456]86/x86/')",
             # Version of the NDK. Used to ensure full rebuilds on NDK rolls.
-            'android_ndk_version%': 'r11c',
+            'android_ndk_version%': 'r12b',
             'host_os%': "<!(uname -s | sed -e 's/Linux/linux/;s/Darwin/mac/')",
             'os_folder_name%': "<!(uname -s | sed -e 's/Linux/linux/;s/Darwin/darwin/')",
           },

infra/mb/mb_config.pyl

@@ -95,11 +95,11 @@
       # Arm.
       'V8 Arm - builder': 'gyp_release_arm',
       'V8 Arm - debug builder': 'gyp_debug_arm',
-      'V8 Android Arm - builder': 'gyp_release_android_arm',
+      'V8 Android Arm - builder': 'gn_release_android_arm',
       'V8 Linux - arm - sim': 'gn_release_simulate_arm',
       'V8 Linux - arm - sim - debug': 'gn_debug_simulate_arm',
       # Arm64.
-      'V8 Android Arm64 - builder': 'gyp_release_android_arm64',
+      'V8 Android Arm64 - builder': 'gn_release_android_arm64',
       'V8 Linux - arm64 - sim': 'gn_release_simulate_arm64',
       'V8 Linux - arm64 - sim - debug': 'gn_debug_simulate_arm64',
       'V8 Linux - arm64 - sim - nosnap - debug':
@@ -187,7 +187,7 @@
       'v8_linux_arm64_gc_stress_dbg': 'gn_debug_simulate_arm64',
       'v8_linux_mipsel_compile_rel': 'gyp_release_simulate_mipsel',
       'v8_linux_mips64el_compile_rel': 'gyp_release_simulate_mips64el',
-      'v8_android_arm_compile_rel': 'gyp_release_android_arm',
+      'v8_android_arm_compile_rel': 'gn_release_android_arm',
     },
   },
 
@@ -247,6 +247,12 @@
     'gn_release_simulate_arm64_trybot': [
       'gn', 'release_trybot', 'simulate_arm64', 'swarming'],
 
+    # GN release configs for arm.
+    'gn_release_android_arm': [
+      'gn', 'release_bot', 'arm', 'android', 'crosscompile', 'swarming'],
+    'gn_release_android_arm64': [
+      'gn', 'release_bot', 'arm64', 'android', 'crosscompile', 'swarming'],
+
     # GN release configs for x64.
     'gn_release_x64': [
       'gn', 'release_bot', 'x64', 'swarming'],
@@ -351,10 +357,6 @@
     # Gyp release configs for arm.
     'gyp_release_arm': [
       'gyp', 'release_bot', 'arm', 'crosscompile', 'hard_float', 'swarming'],
-    'gyp_release_android_arm': [
-      'gyp', 'release_bot', 'arm', 'android', 'crosscompile', 'swarming'],
-    'gyp_release_android_arm64': [
-      'gyp', 'release_bot', 'arm64', 'android', 'crosscompile', 'swarming'],
 
     # Gyp release configs for mips.
     'gyp_release_mips_no_snap_no_i18n': [