Make WebView work for external displays (over Presentations).

ui/android/window_android.h

Index: ui/android/window_android.h
diff --git a/ui/android/window_android.h b/ui/android/window_android.h
index a69a1ddda4e557aac803c640999c422aa3cace4e..16ea18405ff24bd686d370cec8b0105d9d51e1c2 100644
--- a/ui/android/window_android.h
+++ b/ui/android/window_android.h
@@ -13,6 +13,7 @@
 #include "base/observer_list.h"
 #include "base/time/time.h"
 #include "ui/android/ui_android_export.h"
+#include "ui/gfx/android/device_display_info.h"
 #include "ui/gfx/geometry/vector2d_f.h"
 
 namespace ui {
@@ -63,14 +64,21 @@ class UI_ANDROID_EXPORT WindowAndroid {
   void OnActivityPaused(JNIEnv* env, jobject obj);
   void OnActivityResumed(JNIEnv* env, jobject obj);
 
+  const gfx::DeviceDisplayInfo& GetDeviceDisplayInfo();
+  void UpdateDeviceDisplayInfo();
+
  private:
   ~WindowAndroid();
 
+  // TODO ScopedJavaLocalRef ok?
+  base::android::ScopedJavaLocalRef<jobject> GetJavaContext();
+
   base::android::ScopedJavaGlobalRef<jobject> java_window_;
   gfx::Vector2dF content_offset_;
   WindowAndroidCompositor* compositor_;
 
   base::ObserverList<WindowAndroidObserver> observer_list_;
+  scoped_ptr<gfx::DeviceDisplayInfo> device_display_info_;
 
   DISALLOW_COPY_AND_ASSIGN(WindowAndroid);
 };