Introduce fastbuild=2, which completely disables debug information.

build/common.gypi

 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # IMPORTANT:
 # Please don't directly include this file if you are building via gyp_chromium,
 # since gyp_chromium is automatically forcing its inclusion.
 {
   # Variables expected to be overriden on the GYP command line (-D) or by
   # ~/.gyp/include.gypi.
@@ skipping 168 matching lines @@
       'google_tv%': '<(google_tv)',
       'inside_chromium_build%': '<(inside_chromium_build)',
       'enable_app_list%': '<(enable_app_list)',
       'enable_message_center%': '<(enable_message_center)',
       'use_default_render_theme%': '<(use_default_render_theme)',
       'buildtype%': '<(buildtype)',
 
       # Override branding to select the desired branding flavor.
       'branding%': 'Chromium',
 
-      # Set to 1 to enable fast builds. It disables debug info for fastest
-      # compilation.
+      # Set to 1 to enable fast builds. Set to 2 for even faster builds
+      # (it disables debug info for fastest compilation - only for use
+      # on compile-only bots).
       'fastbuild%': 0,
 
       # Set to 1 to enable dcheck in release without having to use the flag.
       'dcheck_always_on%': 0,
 
       # Disable file manager component extension by default.
       'file_manager_extension%': 0,
 
       # Disable image loader component extension by default.
       'image_loader_extension%': 0,
@@ skipping 1590 matching lines @@
       ['input_speech==1', {
         'defines': ['ENABLE_INPUT_SPEECH'],
       }],
       ['notifications==1', {
         'defines': ['ENABLE_NOTIFICATIONS'],
       }],
       ['enable_hidpi==1', {
         'defines': ['ENABLE_HIDPI=1'],
       }],
       ['fastbuild!=0', {
-        # Clang creates chubby debug information, which makes linking very
-        # slow. For now, don't create debug information with clang.  See
-        # http://crbug.com/70000
         'conditions': [
           ['clang==1', {
+            # Clang creates chubby debug information, which makes linking very
+            # slow. For now, don't create debug information with clang.  See
+            # http://crbug.com/70000
             'conditions': [
               ['OS=="linux"', {
                 'variables': {
                   'debug_extra_cflags': '-g0',
                 },
               }],
               # Android builds symbols on release by default, disable them.
               ['OS=="android"', {
                 'variables': {
                   'debug_extra_cflags': '-g0',
                   'release_extra_cflags': '-g0',
                 },
               }],
             ],
           }, { # else clang!=1
             'conditions': [
-              # For Windows and Mac, we don't genererate debug information.
-              ['OS=="win"', {
+              ['OS=="win" and fastbuild==2', {
+                # Completely disable debug information.
+                'msvs_settings': {
+                  'VCLinkerTool': {
+                    'GenerateDebugInformation': 'false',
+                  },
+                  'VCCLCompilerTool': {
+                    'DebugInformationFormat': '0',
+                  },
+                },
+              }],
+              ['OS=="win" and fastbuild==1', {
                 'msvs_settings': {
                   'VCLinkerTool': {
                     # This tells the linker to generate .pdbs, so that
                     # we can get meaningful stack traces.
                     'GenerateDebugInformation': 'true',
                   },
                   'VCCLCompilerTool': {
                     # No debug info to be generated by compiler.
                     'DebugInformationFormat': '0',
                   },
                 },
               }],
               ['OS=="mac"', {
                 'xcode_settings': {
                   'GCC_GENERATE_DEBUGGING_SYMBOLS': 'NO',
                 },
               }],
-              ['OS=="linux"', {
+              ['OS=="linux" and fastbuild==2', {
+                'variables': {
+                  'debug_extra_cflags': '-g0',
+                },
+              }],
+              ['OS=="linux" and fastbuild==1', {
                 'variables': {
                   'debug_extra_cflags': '-g1',
                 },
               }],
-              ['OS=="android"', {
+              ['OS=="android" and fastbuild==2', {
+                'variables': {
+                  'debug_extra_cflags': '-g0',
+                  'release_extra_cflags': '-g0',
+                },
+              }],
+              ['OS=="android" and fastbuild==1', {
                 'variables': {
                   'debug_extra_cflags': '-g1',
                   'release_extra_cflags': '-g1',
                 },
               }],
             ],
           }], # clang!=1
         ],
       }],  # fastbuild!=0
       ['dcheck_always_on!=0', {
@@ skipping 2317 matching lines @@
     # settings in target dicts.  SYMROOT is a special case, because many other
     # Xcode variables depend on it, including variables such as
     # PROJECT_DERIVED_FILE_DIR.  When a source group corresponding to something
     # like PROJECT_DERIVED_FILE_DIR is added to a project, in order for the
     # files to appear (when present) in the UI as actual files and not red
     # red "missing file" proxies, the correct path to PROJECT_DERIVED_FILE_DIR,
     # and therefore SYMROOT, needs to be set at the project level.
     'SYMROOT': '<(DEPTH)/xcodebuild',
   },
 }