Make WebView work for external displays (over Presentations).

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 74e0ada487507f05d3a5f8f8a9e6374eebf39654..740a846bf3f9fe1a3c13012f34f0d1a012403b2a 100644
--- a/ui/gfx/android/device_display_info.h
+++ b/ui/gfx/android/device_display_info.h
@@ -8,6 +8,7 @@
 #include <jni.h>
 #include <string>
 
+#include "base/android/jni_android.h"
 #include "base/basictypes.h"
 #include "ui/gfx/gfx_export.h"
 
@@ -18,8 +19,12 @@ namespace gfx {
 class GFX_EXPORT DeviceDisplayInfo {
  public:
   DeviceDisplayInfo();
+  explicit DeviceDisplayInfo(
+      base::android::ScopedJavaLocalRef<jobject> context);
   ~DeviceDisplayInfo();
 
+  void FetchDisplayInfoFromJava(JNIEnv* env);
+
   // Returns display height in physical pixels.
   int GetDisplayHeight();
 
@@ -56,6 +61,32 @@ class GFX_EXPORT DeviceDisplayInfo {
   // See DeviceDispayInfo.java for more information.
   int GetRotationDegrees();
 
+  // Registers methods with JNI and returns true if succeeded.
+  static bool RegisterDeviceDisplayInfo(JNIEnv* env);
+
+ private:
+  void UpdateDisplayInfo(jint display_height,
+                         jint display_width,
+                         jint physical_display_height,
+                         jint physical_display_width,
+                         jint bits_per_pixel,
+                         jint bits_per_component,
+                         jdouble dip_scale,
+                         jint smallest_dip_width,
+                         jint rotation_degrees);
+
+  base::android::ScopedJavaGlobalRef<jobject> j_device_info_;
+
+  int display_height_;
+  int display_width_;
+  int physical_display_height_;
+  int physical_display_width_;
+  int bits_per_pixel_;
+  int bits_per_component_;
+  double dip_scale_;
+  int smallest_dip_width_;
+  int rotation_degrees_;
+
  private:
   DISALLOW_COPY_AND_ASSIGN(DeviceDisplayInfo);
 };