aura: use TestWebGraphicsContext3D for the shared contexts

content/common/webkitplatformsupport_impl.cc

Index: content/common/webkitplatformsupport_impl.cc
diff --git a/content/common/webkitplatformsupport_impl.cc b/content/common/webkitplatformsupport_impl.cc
index dd7a9fcb7961f2e9fc64ecae629d1b88ff6e5390..991dc1e13d032c3f5f88a200659834b16506a55b 100644
--- a/content/common/webkitplatformsupport_impl.cc
+++ b/content/common/webkitplatformsupport_impl.cc
@@ -13,6 +13,10 @@
 
 namespace content {
 
+namespace {
+WebKitPlatformSupportImpl::OffscreenContextFactory* g_context_factory = NULL;
+}
+
 WebKitPlatformSupportImpl::WebKitPlatformSupportImpl() {
 }
 
@@ -55,6 +59,8 @@ WebKitPlatformSupportImpl::CreateWebSocketBridge(
 WebKit::WebGraphicsContext3D*
 WebKitPlatformSupportImpl::createOffscreenGraphicsContext3D(
     const WebGraphicsContext3D::Attributes& attributes) {
+  if (g_context_factory)
+    return g_context_factory();
   // The WebGraphicsContext3DInProcessImpl code path is used for
   // layout tests (though not through this code) as well as for
   // debugging and bringing up new ports.
@@ -69,6 +75,12 @@ WebKitPlatformSupportImpl::createOffscreenGraphicsContext3D(
   }
 }
 
+// static
+void WebKitPlatformSupportImpl::SetOffscreenContextFactoryForTest(
+      OffscreenContextFactory factory) {
+  g_context_factory = factory;
+}
+
 GpuChannelHostFactory* WebKitPlatformSupportImpl::GetGpuChannelHostFactory() {
   NOTREACHED();
   return NULL;