gpu: Thread-safe command buffer state lookup.

gpu/gles2_conform_support/egl/context.h

Index: gpu/gles2_conform_support/egl/context.h
diff --git a/gpu/gles2_conform_support/egl/context.h b/gpu/gles2_conform_support/egl/context.h
index 22da23b1648eaa93814612ae33c49a3182e7a414..7d45ea70515a63666ca0d2e154c9ea8dafc458ca 100644
--- a/gpu/gles2_conform_support/egl/context.h
+++ b/gpu/gles2_conform_support/egl/context.h
@@ -77,6 +77,7 @@ class Context : public base::RefCountedThreadSafe<Context>,
   bool IsFenceSyncRelease(uint64_t release) override;
   bool IsFenceSyncFlushed(uint64_t release) override;
   bool IsFenceSyncFlushReceived(uint64_t release) override;
+  bool IsFenceSyncReleased(uint64_t release) override;
   void SignalSyncToken(const gpu::SyncToken& sync_token,
                        const base::Closure& callback) override;
   bool CanWaitUnverifiedSyncToken(const gpu::SyncToken* sync_token) override;