Check for a restarted GPU process in OnCreateViewCommandBuffer.

content/browser/renderer_host/gpu_message_filter.h

Index: content/browser/renderer_host/gpu_message_filter.h
diff --git a/content/browser/renderer_host/gpu_message_filter.h b/content/browser/renderer_host/gpu_message_filter.h
index 1d42fb2d9a2dc8da71a6f93fc89d3fa4aeff5f46..92ef5f6a7f43e3166eb85e430370533c145806da 100644
--- a/content/browser/renderer_host/gpu_message_filter.h
+++ b/content/browser/renderer_host/gpu_message_filter.h
@@ -16,7 +16,6 @@
 #include "content/public/browser/browser_message_filter.h"
 #include "ui/gfx/native_widget_types.h"
 
-class GpuProcessHost;
 struct GPUCreateCommandBufferConfig;
 
 namespace gpu {
@@ -24,6 +23,7 @@ struct GPUInfo;
 }
 
 namespace content {
+class GpuProcessHost;
 class RenderWidgetHelper;
 class RenderWidgetHostViewFrameSubscriber;
 
@@ -54,6 +54,8 @@ class GpuMessageFilter : public BrowserMessageFilter {
 
   virtual ~GpuMessageFilter();
 
+  GpuProcessHost* GetGpuProcessHost(CauseForGpuLaunch cause_for_gpu_launch);
+
   // Message handlers called on the browser IO thread:
   void OnEstablishGpuChannel(CauseForGpuLaunch,
                              IPC::Message* reply);