Fix Linux coverage which doesn't like a gyp 'inputs' to contain non-files....

chrome/chrome_tests.gypi

 # Copyright (c) 2010 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' : {
     'browser_tests_sources_views_specific': [
       'browser/extensions/browser_action_test_util_views.cc',
       'browser/views/browser_actions_container_browsertest.cc',
     ],
@@ skipping 2402 matching lines @@
               # Placeholder; empty for now.
               ]}],
           ],  # 'conditions'
           'actions': [
             {
               # 'message' for Linux/scons in particular.  Scons
               # requires the 'coverage' target be run from within
               # src/chrome.
               'message': 'Compiling coverage bundles.',
               # MSVS must have an input file and an output file.
-              'inputs': [ '<@(_dependencies)' ],
+              #
+              # TODO(jrg):
+              # Technically I want inputs to be the list of
+              # executables created in <@(_dependencies) but use of
+              # that variable lists the dep by dep name, not their
+              # output executable name.
+              # Is there a better way to force this action to run, always?
+              #
+              # If a test bundle is added to this coverage_build target it
+              # necessarily means this file (chrome_tests.gypi) is changed,
+              # so the action is run (coverage_bundles.py is generated).
+              # Exceptions to that rule are theoretically possible 
+              # (e.g. re-gyp with a GYP_DEFINES set).
+              # Else it's the same list of bundles as last time.  They are
+              # built (since on the deps list) but the action may not run.
+              # For now, things work, but it's less than ideal.
+              'inputs': [ 'chrome_tests.gypi' ],
               'outputs': [ '<(PRODUCT_DIR)/coverage_bundles.py' ],
               'action_name': 'coverage_build',
               'action': [ 'python', '-c',
                           'import os; '
                           'f = open(' \
                           '\'<(PRODUCT_DIR)\' + os.path.sep + ' \
                           '\'coverage_bundles.py\'' \
                           ', \'w\'); ' \
                           'deplist = \'' \
                           '<@(_dependencies)' \
@@ skipping 44 matching lines @@
       ]
     }],  # 'coverage!=0'
   ],  # 'conditions'
 }
 
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