Report lost context from GLES2Implementation based on share group state.

gpu/command_buffer/client/gpu_control.h

Index: gpu/command_buffer/client/gpu_control.h
diff --git a/gpu/command_buffer/client/gpu_control.h b/gpu/command_buffer/client/gpu_control.h
index 7baf62c2e2229a6023193dc251f3ef87b74fb347..813d5630960734f3f1c3661bed5048cc9ab70f01 100644
--- a/gpu/command_buffer/client/gpu_control.h
+++ b/gpu/command_buffer/client/gpu_control.h
@@ -69,10 +69,6 @@ class GPU_EXPORT GpuControl {
   // may not be supported with all implementations.
   virtual void SetLock(base::Lock*) = 0;
 
-  // Returns true if the channel to the Gpu is lost. When true, all contexts
-  // should be considered as lost.
-  virtual bool IsGpuChannelLost() = 0;
-
   // When this function returns it ensures all previously flushed work is
   // visible by the service. This command does this by sending a synchronous
   // IPC. Note just because the work is visible to the server does not mean