Add GetScrollOffset function to PPB_View

ppapi/tests/test_view.h

 // Copyright (c) 2011 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 PPAPI_TEST_TEST_VIEW_H_
 #define PPAPI_TEST_TEST_VIEW_H_
 
 #include "ppapi/cpp/view.h"
 #include "ppapi/tests/test_case.h"
 
@@ skipping 17 matching lines @@
   // Returns true if we got a view changed, false if it timed out.
   bool WaitUntilViewChanged();
 
   void QuitMessageLoop(int32_t result);
 
   std::string TestCreatedVisible();
   std::string TestCreatedInvisible();
   std::string TestPageHideShow();
   std::string TestSizeChange();
   std::string TestClipChange();
+  std::string TestScrollOffsetChange();
 
   pp::View last_view_;
 
   // DidChangeView stores the page visibility in this vector on each
   // invocation so tests can check it.
   std::vector<bool> page_visibility_log_;
 
   // Set to true to request that the next invocation of DidChangeView should
   // post a quit to the message loop. DidChangeView will also reset the flag so
   // this will only happen once.
   bool post_quit_on_view_changed_;
 };
 
 #endif  // PPAPI_TEST_TEST_VIEW_H_