Enable scavenging in RenderThread::IdleHandler.

chrome/chrome.gyp

Index: chrome/chrome.gyp
===================================================================
--- chrome/chrome.gyp	(revision 26198)
+++ chrome/chrome.gyp	(working copy)
@@ -2926,13 +2926,23 @@
         ['OS=="linux"', {
           'dependencies': [
             '../build/linux/system.gyp:gtk',
+            '../third_party/tcmalloc/tcmalloc.gyp:tcmalloc',
           ],
+          'export_dependent_settings': [
+            '../third_party/tcmalloc/tcmalloc.gyp:tcmalloc',
+          ],
         }],
         # Windows-specific rules.
         ['OS=="win"', {
           'include_dirs': [
             'third_party/wtl/include',
           ],
+          'dependencies': [
+            '../third_party/tcmalloc/tcmalloc.gyp:tcmalloc',
+          ],
+          'export_dependent_settings': [
+            '../third_party/tcmalloc/tcmalloc.gyp:tcmalloc',
+          ],
         },],
       ],
     },
@@ -3589,6 +3599,9 @@
         '../testing/gmock.gyp:gmock',
         '../testing/gtest.gyp:gtest',
       ],
+      'export_dependent_settings': [
+        'renderer',
+      ],
       'include_dirs': [
         '..',
       ],
@@ -3669,6 +3682,9 @@
         '../skia/skia.gyp:skia',
         '../testing/gtest.gyp:gtest',
       ],
+      'export_dependent_settings': [
+        'test_support_common',
+      ],
       'include_dirs': [
         '..',
       ],
@@ -4666,7 +4682,6 @@
                 '../net/net.gyp:net_resources',
                 '../build/util/support/support.gyp:*',
                 '../third_party/cld/cld.gyp:cld',
-                '../third_party/tcmalloc/tcmalloc.gyp:tcmalloc',
                 '../views/views.gyp:views',
                 '../webkit/webkit.gyp:webkit_resources',
                 '../gears/gears.gyp:gears',