Code coverage improvements....

chrome/chrome.gyp

 # Copyright (c) 2009 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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
   'includes': [
     '../build/common.gypi',
@@ skipping 2979 matching lines @@
           'configurations': {
             'Debug': {
               'msvs_precompiled_header': 'tools/build/win/precompiled.h',
               'msvs_precompiled_source': 'tools/build/win/precompiled.cc',
             },
           },
         },
       ]},  # 'targets'
     ],  # OS=="win"
     # TODO(jrg): add in Windows code coverage targets.
-    # Also test on Linux.
-    ['coverage!=0 and OS=="mac"',
+    ['coverage!=0 and OS!="win"',
       { 'targets': [
         {
           'target_name': 'coverage',
           # do NOT place this in the 'all' list; most won't want it.
           # In gyp, booleans are 0/1 not True/False.
           'suppress_wildcard': 1,
           'type': 'none',
           'dependencies': [
             '../base/base.gyp:base_unittests',
+            '../media/media.gyp:media_unittests',
+            '../net/net.gyp:net_unittests',
+            '../printing/printing.gyp:printing_unittests',
           ],
           'actions': [
             {
+              # 'message' for Linux/scons in particular
+              'message': 'Running coverage_posix.py to generate coverage numbers',
               'inputs': [],
               'outputs': [],
               'action_name': 'coverage',
               'action': [ 'python',
                           '../tools/code_coverage/coverage_posix.py',
                           '--directory',
-                          '<(PRODUCT_DIR)' ],
+                          '<(PRODUCT_DIR)',
+                          '--',
+                          '<@(_dependencies)'],
+              # Use outputs of this action as inputs for the main target build.
+              # Seems as a misnomer but makes this happy on Linux (scons).
+              'process_outputs_as_sources': 1,
             },
           ],  # 'actions'
         },
       ]
     }],
   ],  # 'conditions'
 }