Tool to log the execution of Chrome. Initial add.

build/common.gypi

Index: build/common.gypi
diff --git a/build/common.gypi b/build/common.gypi
index 47e937d214532028a7c5fed7531dc84f2f908214..58e5385467fb4e4b31ed2c9a4e959ebc503289ac 100644
--- a/build/common.gypi
+++ b/build/common.gypi
@@ -233,6 +233,10 @@
       # See https://sites.google.com/a/chromium.org/dev/developers/testing/addresssanitizer
       'asan%': 0,
 
+      # Set to true to instrument the code with function call logger.
+      # See src/third_party/cygprofile/cyg-profile.cc for details.
+      'order_profiling%': 0,
+
       # Use the provided profiled order file to link Chrome image with it.
       # This makes Chrome faster by better using CPU cache when executing code.
       # This is known as PGO (profile guided optimization).
@@ -544,6 +548,7 @@
     'notifications%': '<(notifications)',
     'clang_use_chrome_plugins%': '<(clang_use_chrome_plugins)',
     'asan%': '<(asan)',
+    'order_profiling%': '<(order_profiling)',
     'order_text_section%': '<(order_text_section)',
     'enable_extensions%': '<(enable_extensions)',
     'enable_web_intents%': '<(enable_web_intents)',
@@ -2195,6 +2200,15 @@
               'ADDRESS_SANITIZER',
             ],
           }],
+          ['order_profiling!=0 and (chromeos==1 or OS=="linux")', {
+            'target_conditions' : [
+              ['_toolset=="target"', {
+                'cflags': [
+                  '-finstrument-functions',
+                ],
+              }],
+            ],
+          }],
           ['linux_breakpad==1', {
             'cflags': [ '-g' ],
             'defines': ['USE_LINUX_BREAKPAD'],