Move content offset to ViewAndroid

ui/android/view_android.h

Index: ui/android/view_android.h
diff --git a/ui/android/view_android.h b/ui/android/view_android.h
index d05520d514b7ee525f1b85ec78f8fb7ceb1cd04b..3f5b2e4b66baa617f2828c4f7eab4136d0c146d2 100644
--- a/ui/android/view_android.h
+++ b/ui/android/view_android.h
@@ -60,6 +60,16 @@ class UI_ANDROID_EXPORT ViewAndroid {
   ViewAndroid();
   virtual ~ViewAndroid();
 
+  // The content offset is used to translate snapshots to
+  // the correct part of the view.
+  void set_content_offset(const gfx::Vector2dF& content_offset) {
+    content_offset_ = content_offset;
+  }
+
+  gfx::Vector2dF content_offset() const {
+    return content_offset_;
+  }
+
   // Returns the window at the root of this hierarchy, or |null|
   // if disconnected.
   virtual WindowAndroid* GetWindowAndroid() const;
@@ -126,6 +136,7 @@ class UI_ANDROID_EXPORT ViewAndroid {
 
   int physical_width_pix_;
   int physical_height_pix_;
+  gfx::Vector2dF content_offset_;  // in CSS pixel
 
   DISALLOW_COPY_AND_ASSIGN(ViewAndroid);
 };