Make WebView work for external displays (over Presentations).

ui/android/window_android.cc

Index: ui/android/window_android.cc
diff --git a/ui/android/window_android.cc b/ui/android/window_android.cc
index 9a47689295afe6df8ef074eb64a5ce72946640b9..acbfdf6963af6202c93997cc89cee947a851bf8a 100644
--- a/ui/android/window_android.cc
+++ b/ui/android/window_android.cc
@@ -113,6 +113,24 @@ void WindowAndroid::OnActivityPaused(JNIEnv* env, jobject obj) {
   FOR_EACH_OBSERVER(WindowAndroidObserver, observer_list_, OnActivityPaused());
 }
 
+std::shared_ptr<gfx::DeviceDisplayInfo> WindowAndroid::GetDeviceDisplayInfo() {
+  if (!device_display_info_) {
+    UpdateDeviceDisplayInfo();
+  }
+  return device_display_info_;
+}
+
+void WindowAndroid::UpdateDeviceDisplayInfo()
+{
+  device_display_info_ = std::shared_ptr<gfx::DeviceDisplayInfo>(
+      new gfx::DeviceDisplayInfo(GetJavaContext()));
+}
+
+base::android::ScopedJavaLocalRef<jobject> WindowAndroid::GetJavaContext() {
+  JNIEnv* env = AttachCurrentThread();
+  return Java_WindowAndroid_getContext(env, GetJavaObject().obj());
+}
+
 // ----------------------------------------------------------------------------
 // Native JNI methods
 // ----------------------------------------------------------------------------