Reland of Added HardwareAccelerationEnabled() function

content/public/browser/gpu_data_manager.h

Index: content/public/browser/gpu_data_manager.h
diff --git a/content/public/browser/gpu_data_manager.h b/content/public/browser/gpu_data_manager.h
index 2152211a2f8506b03622214af69248a637637082..47767fdecd945850dedbb78f4024c82235010461 100644
--- a/content/public/browser/gpu_data_manager.h
+++ b/content/public/browser/gpu_data_manager.h
@@ -100,6 +100,9 @@
   // Turn off all hardware acceleration.
   virtual void DisableHardwareAcceleration() = 0;
 
+  // Whether a GPU is in use (as opposed to a software renderer).
+  virtual bool HardwareAccelerationEnabled() const = 0;
+
   // Whether the browser compositor can be used.
   virtual bool CanUseGpuBrowserCompositor() const = 0;