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 5f5b9731aee2d8ab73e22abf28a24314a98dd73f..afe66858d85c574ed9aac32c65ff3d379ab11d1c 100644
--- a/ui/android/window_android.cc
+++ b/ui/android/window_android.cc
@@ -130,6 +130,24 @@ bool WindowAndroid::CanRequestPermission(const std::string& permission) {
       base::android::ConvertUTF8ToJavaString(env, permission).obj());
 }
 
+const gfx::DeviceDisplayInfo& WindowAndroid::GetDeviceDisplayInfo() {
+  if (!device_display_info_) {
+    UpdateDeviceDisplayInfo();
+  }
+  return *device_display_info_;
+}
+
+void WindowAndroid::UpdateDeviceDisplayInfo() {
+  device_display_info_ = make_scoped_ptr(
+      new gfx::DeviceDisplayInfo(GetJavaDisplayContext().obj()));
+}
+
+base::android::ScopedJavaLocalRef<jobject>
+WindowAndroid::GetJavaDisplayContext() {
+  JNIEnv* env = AttachCurrentThread();
+  return Java_WindowAndroid_getDisplayContext(env, GetJavaObject().obj());
+}
+
 // ----------------------------------------------------------------------------
 // Native JNI methods
 // ----------------------------------------------------------------------------