Add ContextProvider::InvalidateGrContext to reset GL state in GrContext

content/common/gpu/client/context_provider_command_buffer.cc

Index: content/common/gpu/client/context_provider_command_buffer.cc
diff --git a/content/common/gpu/client/context_provider_command_buffer.cc b/content/common/gpu/client/context_provider_command_buffer.cc
index eb7096499b2d23d29552e8c61b652968f97e7267..2f00de1fe296877762620733ff3c02dcad436d66 100644
--- a/content/common/gpu/client/context_provider_command_buffer.cc
+++ b/content/common/gpu/client/context_provider_command_buffer.cc
@@ -143,6 +143,14 @@ class GrContext* ContextProviderCommandBuffer::GrContext() {
   return gr_context_->get();
 }
 
+void ContextProviderCommandBuffer::InvalidateGrContext(uint32_t state) {
+  if (gr_context_) {
+    DCHECK(lost_context_callback_proxy_);  // Is bound to thread.
+    DCHECK(context_thread_checker_.CalledOnValidThread());
+    gr_context_->get()->resetContext(state);
+  }
+}
+
 void ContextProviderCommandBuffer::SetupLock() {
   DCHECK(context3d_);
   context3d_->GetCommandBufferProxy()->SetLock(&context_lock_);