Add signalSyncPoint to the WebGraphicsContext3D command buffer impls.

webkit/gpu/webgraphicscontext3d_in_process_command_buffer_impl.cc

Index: webkit/gpu/webgraphicscontext3d_in_process_command_buffer_impl.cc
diff --git a/webkit/gpu/webgraphicscontext3d_in_process_command_buffer_impl.cc b/webkit/gpu/webgraphicscontext3d_in_process_command_buffer_impl.cc
index c63e85585557856c6eb46ac035fe8ebd2aa2bb37..d9e0a57f25221ca480e98e933e515689a086ec26 100644
--- a/webkit/gpu/webgraphicscontext3d_in_process_command_buffer_impl.cc
+++ b/webkit/gpu/webgraphicscontext3d_in_process_command_buffer_impl.cc
@@ -1791,6 +1791,17 @@ DELEGATE_TO_GL_2(consumeTextureCHROMIUM, ConsumeTextureCHROMIUM,
 DELEGATE_TO_GL_2(drawBuffersEXT, DrawBuffersEXT,
                  WGC3Dsizei, const WGC3Denum*)
 
+unsigned WebGraphicsContext3DInProcessCommandBufferImpl::insertSyncPoint() {
+  shallowFlushCHROMIUM();
+  return 0;
+}
+
+void WebGraphicsContext3DInProcessCommandBufferImpl::signalSyncPoint(
+    unsigned sync_point,
+    WebGraphicsSyncPointCallback* callback) {
+  callback->onSyncPointReached();
+}
+
 DELEGATE_TO_GL_9(asyncTexImage2DCHROMIUM, AsyncTexImage2DCHROMIUM,
     WGC3Denum, WGC3Dint, WGC3Denum, WGC3Dsizei, WGC3Dsizei, WGC3Dint,
     WGC3Denum, WGC3Denum, const void*)