Cache DeviceDisplayInfo data in shared structure on native side to avoid frequent JNI calls.

ui/gfx/android/device_display_info.h

Index: ui/gfx/android/device_display_info.h
diff --git a/ui/gfx/android/device_display_info.h b/ui/gfx/android/device_display_info.h
index ace8569c73373ac1e83a83719d3f793798ba85d5..83968e9b51eb537edcea484d7c39863510becd15 100644
--- a/ui/gfx/android/device_display_info.h
+++ b/ui/gfx/android/device_display_info.h
@@ -8,7 +8,6 @@
 #include <jni.h>
 #include <string>
 
-#include "base/android/scoped_java_ref.h"
 #include "base/basictypes.h"
 #include "ui/gfx/gfx_export.h"
 
@@ -40,12 +39,7 @@ class GFX_EXPORT DeviceDisplayInfo {
   // Smallest possible screen size in density-independent pixels.
   int GetSmallestDIPWidth();
 
-  // Registers methods with JNI and returns true if succeeded.
-  static bool RegisterDeviceDisplayInfo(JNIEnv* env);
-
  private:
-  base::android::ScopedJavaGlobalRef<jobject> j_device_info_;
-
   DISALLOW_COPY_AND_ASSIGN(DeviceDisplayInfo);
 };