Enable /PROFILE for Release builds and remove it from Debug builds.

build/common.gypi

 # Copyright (c) 2011 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 1136 matching lines @@
               ['win_release_InlineFunctionExpansion==0', {
                 'AdditionalOptions': ['/Ob0'],
               }],
               ['win_release_InlineFunctionExpansion!=""', {
                 'InlineFunctionExpansion':
                   '<(win_release_InlineFunctionExpansion)',
               }],
             ],
           },
           'VCLinkerTool': {
+            # LinkIncremental is a tri-state boolean, where 0 means default

[M-A Ruel, 2011/08/08 15:21:17]

"tri-state variable"

It's _not_ a boolean. :)

+            # (i.e., inherit from parent solution), 1 means false, and
+            # 2 means true.
             'LinkIncremental': '1',
+            # This corresponds to the /PROFILE flag which ensures the PDB
+            # file contains FIXUP information (growing the PDB file by about
+            # 5%) but does not otherwise alter the output binary. This
+            # information is used by the Syzygy optimization tool when
+            # decomposing the release image.
+            'Profile': 'true',
           },
         },
         'conditions': [
           ['release_valgrind_build==0', {
             'defines': [
               'NVALGRIND',
               'DYNAMIC_ANNOTATIONS_ENABLED=0',
             ],
           }, {
             'defines': [
@@ skipping 757 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',
   },
 }