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_string.h"
 #include "base/android/jni_weak_ref.h"
@@ skipping 112 matching lines @@
 }
 
 bool WindowAndroid::CanRequestPermission(const std::string& permission) {
   JNIEnv* env = AttachCurrentThread();
   return Java_WindowAndroid_canRequestPermission(
       env,
       GetJavaObject().obj(),
       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_ = scoped_ptr<gfx::DeviceDisplayInfo>(
+      new gfx::DeviceDisplayInfo(GetJavaContext()));
+}
+
+base::android::ScopedJavaLocalRef<jobject> WindowAndroid::GetJavaContext() {
+  JNIEnv* env = AttachCurrentThread();
+  return Java_WindowAndroid_getDisplayContext(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