Allow MessageFilters to restrict listening to specific message classes

content/browser/renderer_host/gpu_message_filter.cc

Index: content/browser/renderer_host/gpu_message_filter.cc
diff --git a/content/browser/renderer_host/gpu_message_filter.cc b/content/browser/renderer_host/gpu_message_filter.cc
index 4dc49bb1f6ba55c06966b846994234cf9d989866..d1cbac1763c7e9309399ba9d6d8f9815d4d83ff4 100644
--- a/content/browser/renderer_host/gpu_message_filter.cc
+++ b/content/browser/renderer_host/gpu_message_filter.cc
@@ -21,6 +21,11 @@
 #include "gpu/command_buffer/service/gpu_switches.h"
 
 namespace content {
+namespace {
+const uint32 kFilteredMessageClasses[] = {
+  GpuMsgStart,
+};
+}  // namespace
 
 struct GpuMessageFilter::CreateViewCommandBufferRequest {
   CreateViewCommandBufferRequest(
@@ -54,7 +59,9 @@ struct GpuMessageFilter::FrameSubscription {
 
 GpuMessageFilter::GpuMessageFilter(int render_process_id,
                                    RenderWidgetHelper* render_widget_helper)
-    : gpu_process_id_(0),
+    : BrowserMessageFilter(
+          kFilteredMessageClasses, arraysize(kFilteredMessageClasses)),
+      gpu_process_id_(0),
       render_process_id_(render_process_id),
       share_contexts_(false),
       render_widget_helper_(render_widget_helper),