Explicitly free shared memory buffers on GL client destruction.

gpu/command_buffer/client/gles2_implementation.cc

Index: gpu/command_buffer/client/gles2_implementation.cc
diff --git a/gpu/command_buffer/client/gles2_implementation.cc b/gpu/command_buffer/client/gles2_implementation.cc
index e19911c81705b831b8e470ad5a0eb025afb46a0d..cdaad8262ae3487b9ea24842f84c554f58eca738 100644
--- a/gpu/command_buffer/client/gles2_implementation.cc
+++ b/gpu/command_buffer/client/gles2_implementation.cc
@@ -204,8 +204,8 @@ GLES2Implementation::~GLES2Implementation() {
   // If it's destroyed it will use this GLES2Implemenation.
   share_group_->SetGLES2ImplementationForDestruction(this);
   share_group_ = NULL;
-  // Make sure the commands make it the service.
-  Finish();
+  // Finally, finish commands and free shared memory buffers.
+  FreeEverything();
 }
 
 GLES2CmdHelper* GLES2Implementation::helper() const {
@@ -250,7 +250,8 @@ void GLES2Implementation::FreeUnusedSharedMemory() {
 
 void GLES2Implementation::FreeEverything() {
   Finish();
-  query_tracker_->Shrink();
+  if (query_tracker_.get())
+    query_tracker_->Shrink();
   FreeUnusedSharedMemory();
   transfer_buffer_->Free();
   helper_->FreeRingBuffer();