gpu: Add sync token dependencies to flush metadata.

gpu/command_buffer/client/gles2_implementation.h

Index: gpu/command_buffer/client/gles2_implementation.h
diff --git a/gpu/command_buffer/client/gles2_implementation.h b/gpu/command_buffer/client/gles2_implementation.h
index a0f2d12259af4f9b0f78663c59f3d90d6b0f0ea7..25bbd9eb668b9439deab588341ca137fc02e6327 100644
--- a/gpu/command_buffer/client/gles2_implementation.h
+++ b/gpu/command_buffer/client/gles2_implementation.h
@@ -251,10 +251,14 @@ class GLES2_IMPL_EXPORT GLES2Implementation
   // ContextSupport implementation.
   void SignalSyncToken(const gpu::SyncToken& sync_token,
                        const base::Closure& callback) override;
-  bool IsSyncTokenSignalled(const gpu::SyncToken& sync_token) override;
+  bool IsSyncTokenSignaled(const gpu::SyncToken& sync_token) override;
   void SignalQuery(uint32_t query, const base::Closure& callback) override;
   void SetAggressivelyFreeResources(bool aggressively_free_resources) override;
 
+  // Helper to set verified bit on sync token if allowed by gpu control.
+  bool GetVerifiedSyncTokenForIPC(const gpu::SyncToken& sync_token,
+                                  gpu::SyncToken* verified_sync_token);
+
   // base::trace_event::MemoryDumpProvider implementation.
   bool OnMemoryDump(const base::trace_event::MemoryDumpArgs& args,
                     base::trace_event::ProcessMemoryDump* pmd) override;