Remove dip scale dependency from ui::WindowAndroid

ui/android/window_android.h

 // 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.
 
 #ifndef UI_ANDROID_WINDOW_ANDROID_H_
 #define UI_ANDROID_WINDOW_ANDROID_H_
 
 #include <jni.h>
 #include <string>
 #include <vector>
@@ skipping 17 matching lines @@
 class UI_ANDROID_EXPORT WindowAndroid : public ViewAndroid {
  public:
   WindowAndroid(JNIEnv* env, jobject obj);
 
   void Destroy(JNIEnv* env, const base::android::JavaParamRef<jobject>& obj);
 
   base::android::ScopedJavaLocalRef<jobject> GetJavaObject();
 
   static bool RegisterWindowAndroid(JNIEnv* env);
 
-  // The content offset is used to translate snapshots to the correct part of
-  // the window.
+  // The content offset in CSS pixels. It is used together with device scale
+  // factor to translate snapshots to the correct part of the window.
   void set_content_offset(const gfx::Vector2dF& content_offset) {
     content_offset_ = content_offset;
   }
 
   gfx::Vector2dF content_offset() const {
     return content_offset_;
   }
 
   // Compositor callback relay.
   void OnCompositingDidCommit();
@@ skipping 39 matching lines @@
   WindowAndroidCompositor* compositor_;
 
   base::ObserverList<WindowAndroidObserver> observer_list_;
 
   DISALLOW_COPY_AND_ASSIGN(WindowAndroid);
 };
 
 }  // namespace ui
 
 #endif  // UI_ANDROID_WINDOW_ANDROID_H_