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 c36087b6357fdad543bc89e93c7d209ccc3fdff1..5264d009fa33ee13babc12a3baf8eded1722115b 100644
--- a/ui/android/window_android.h
+++ b/ui/android/window_android.h
@@ -14,6 +14,7 @@
 #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 {
@@ -69,6 +70,11 @@ class UI_ANDROID_EXPORT WindowAndroid {
   // Return whether the specified Android permission can be requested by Chrome.
   bool CanRequestPermission(const std::string& permission);
 
+  const gfx::DeviceDisplayInfo& GetDeviceDisplayInfo();
+  void UpdateDeviceDisplayInfo();
+
+  base::android::ScopedJavaLocalRef<jobject> GetJavaDisplayContext();
+
  private:
   ~WindowAndroid();
 
@@ -77,6 +83,7 @@ class UI_ANDROID_EXPORT WindowAndroid {
   WindowAndroidCompositor* compositor_;
 
   base::ObserverList<WindowAndroidObserver> observer_list_;
+  scoped_ptr<gfx::DeviceDisplayInfo> device_display_info_;
 
   DISALLOW_COPY_AND_ASSIGN(WindowAndroid);
 };