Enable builtin Mojo JS modules in layout tests

content/public/browser/content_browser_client.h

Index: content/public/browser/content_browser_client.h
diff --git a/content/public/browser/content_browser_client.h b/content/public/browser/content_browser_client.h
index 2145e4418f4c53f0b96bcfa7be95b0b2f0b57094..3d2e6af1672444d6e08e5f182d00996aaaa0fa65 100644
--- a/content/public/browser/content_browser_client.h
+++ b/content/public/browser/content_browser_client.h
@@ -720,6 +720,10 @@ class CONTENT_EXPORT ContentBrowserClient {
   // protected content.
   virtual scoped_ptr<media::CdmFactory> CreateCdmFactory();
 
+  // Allows the embedder to override the default bindings available to a render
+  // view. This must return a bitwise OR of BindingsPolicy values.
+  virtual int GetDefaultEnabledBindingsForView(RenderViewHost* view);

[Charlie Reis, 2016/01/15 01:26:51]

Hmm, no one outside content/ is using this.  John, does content shell count as
"outside content" in terms of adding public APIs like this?

[jam, 2016/01/15 02:25:15]

correct. content/shell can only use content/public (so that it can be a good
example of embedding content)

[jam, 2016/01/15 02:25:15]

Why isn't this on WebContentsDelegate? ContentBrowserClient is a last-resort
place to put methods, to avoid making it even larger, where a more focused
delegate interface exists.

[Ken Rockot(use gerrit already), 2016/01/24 23:03:51]

Actually that's not even necessary either. I've gone an even simpler (and IMHO
safer) route and explicitly add the bindings from content_shell's
WebContentsDelegate if and only if --run-layout-test is set.

+
   // Populates |mappings| with all files that need to be mapped before launching
   // a child process.
 #if defined(OS_ANDROID)