Downstreamed v8 extension building & webkit_chromium_port flag
1. Downstreamed building webkit/extension/v8/*.cc files, which were built by upstream webcore by mistake. Now glue will build them.
   I tested that even though webcore still builds them, there are no errors if glue also builds them.
2. Added webkit_chromium_port variable to build/common.gypi which is turned off by default. Currently, nothing uses it but the chrome port will need it.

Review URL: http://codereview.chromium.org/220026

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@27122 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/build/common.gypi b/build/common.gypi
index ebb6262..dfe931c 100644
--- a/build/common.gypi
+++ b/build/common.gypi
@@ -49,6 +49,11 @@
 
       # Defaults to a desktop build, overridden via command line/env.
       'chromeos%': 0,
+
+      # This variable tells WebCore.gyp and JavaScriptCore.gyp whether they are
+      # are built under a chromium full build (1) or a webkit.org chromium
+      # build (0).
+      'inside_chromium_build%': 1,
     },
 
     # Define branding and buildtype on the basis of their settings within the
@@ -58,6 +63,7 @@
     'target_arch%': '<(target_arch)',
     'toolkit_views%': '<(toolkit_views)',
     'chromeos%': '<(chromeos)',
+    'inside_chromium_build%': '<(inside_chromium_build)',
 
     # Override chromium_mac_pch and set it to 0 to suppress the use of
     # precompiled headers on the Mac.  Prefix header injection may still be