Provide shared context to Platform API in renderer.

content/browser/in_process_webkit/browser_webkitplatformsupport_impl.cc

Index: content/browser/in_process_webkit/browser_webkitplatformsupport_impl.cc
diff --git a/content/browser/in_process_webkit/browser_webkitplatformsupport_impl.cc b/content/browser/in_process_webkit/browser_webkitplatformsupport_impl.cc
index 5a23c8749ae87008a24d5660279ec58489be6538..62537d8ab6df4c5cb4c48bf37d883738e5a3fbb4 100644
--- a/content/browser/in_process_webkit/browser_webkitplatformsupport_impl.cc
+++ b/content/browser/in_process_webkit/browser_webkitplatformsupport_impl.cc
@@ -120,9 +120,22 @@ int BrowserWebKitPlatformSupportImpl::databaseDeleteFile(
   return file_util::Delete(path, false) ? 0 : 1;
 }
 
-GpuChannelHostFactory*
-BrowserWebKitPlatformSupportImpl::GetGpuChannelHostFactory() {
-  return BrowserGpuChannelHostFactory::instance();
+WebKit::WebGraphicsContext3D* BrowserWebKitPlatformSupportImpl::
+    createOffscreenGraphicsContext3D(
+        const WebKit::WebGraphicsContext3D::Attributes& attributes) {
+  NOTREACHED();
+  return NULL;

[jamesr, 2013/03/06 00:26:10]

Why bother overriding this?  Isn't there a default null-returning implementation
somewhere further up the inheritance chain?

[danakj, 2013/03/06 00:27:10]

There is, in the Platform class. This just adds a NOTREACHED() so we know
browser-side shinanigans are happening. I can remove it if you like?

+}
+
+WebKit::WebGraphicsContext3D* BrowserWebKitPlatformSupportImpl::
+     sharedOffscreenGraphicsContext3D() {
+  NOTREACHED();
+  return NULL;
+}
+
+GrContext* BrowserWebKitPlatformSupportImpl::sharedOffscreenGrContext() {
+  NOTREACHED();
+  return NULL;
 }
 
 }  // namespace content