Code coverage on Windows

build/common.gypi

Index: build/common.gypi
===================================================================
--- build/common.gypi	(revision 19085)
+++ build/common.gypi	(working copy)
@@ -66,7 +66,7 @@
     'toolkit_views%': 0,
 
     'linux2%': 0,
-    
+
     'chrome_personalization%': 0,
   },
   'target_defaults': {
@@ -113,10 +113,22 @@
                         '-fprofile-arcs' ],
             'link_settings': { 'libraries': [ '-lgcov' ] },
           }],
-        ]},
-      # TODO(jrg): options for code coverage on Windows
-      ],
-    ],
+          # Finally, for Windows, we simply turn on profiling.
+          ['OS=="win"', {
+            'msvs_settings': {
+              'VCLinkerTool': {
+                'Profile': 'true',
+              },
+	      'VCCLCompilerTool': {
+                # /Z7, not /Zi, so coverage is happy
+                'DebugInformationFormat': '1',
+                'AdditionalOptions': '/Yd',
+              }
+            }
+         }],  # OS==win
+        ],  # conditions for coverage
+      }],  # coverage!=0
+    ],  # conditions for 'target_defaults'
     'default_configuration': 'Debug',
     'configurations': {
        # VCLinkerTool LinkIncremental values below: