Add tracing for GL texture objects

gpu/command_buffer/service/memory_tracking.h

Index: gpu/command_buffer/service/memory_tracking.h
diff --git a/gpu/command_buffer/service/memory_tracking.h b/gpu/command_buffer/service/memory_tracking.h
index a7447e4e5d5dbe5ec8226fe63d68c13b64a15fef..a60c3a92c687859519ca1a6cf1749c8ba7112ddf 100644
--- a/gpu/command_buffer/service/memory_tracking.h
+++ b/gpu/command_buffer/service/memory_tracking.h
@@ -30,6 +30,9 @@ class MemoryTracker : public base::RefCounted<MemoryTracker> {
    // Ensure a certain amount of GPU memory is free. Returns true on success.
    virtual bool EnsureGPUMemoryAvailable(size_t size_needed) = 0;
 
+   // Id which identifies the GPU client for whom memory is being allocated.
+   virtual uint64_t ClientTracingId() = 0;
+
  protected:
   friend class base::RefCounted<MemoryTracker>;
   MemoryTracker() {}