Make WebView work for external displays (over Presentations).

ui/android/window_android.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/android/window_android.h"
 
 #include "base/android/jni_android.h"
 #include "base/android/jni_array.h"
 #include "base/android/jni_weak_ref.h"
 #include "base/android/scoped_java_ref.h"
@@ skipping 95 matching lines @@
 }
 
 void WindowAndroid::OnActivityResumed(JNIEnv* env, jobject obj) {
   FOR_EACH_OBSERVER(WindowAndroidObserver, observer_list_, OnActivityResumed());
 }
 
 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
 // ----------------------------------------------------------------------------
 
 jlong Init(JNIEnv* env, jobject obj) {
   WindowAndroid* window = new WindowAndroid(env, obj);
   return reinterpret_cast<intptr_t>(window);
 }
 
 }  // namespace ui