Added pinch viewport offset to page state.

content/common/page_state_serialization.h

Index: content/common/page_state_serialization.h
diff --git a/content/common/page_state_serialization.h b/content/common/page_state_serialization.h
index 43efb53da447335b90f1e3b4a7aefaf137e20a7f..d3d3b02973915fd80115a376005d318504746d17 100644
--- a/content/common/page_state_serialization.h
+++ b/content/common/page_state_serialization.h
@@ -12,6 +12,7 @@
 #include "third_party/WebKit/public/platform/WebHTTPBody.h"
 #include "third_party/WebKit/public/platform/WebReferrerPolicy.h"
 #include "ui/gfx/point.h"
+#include "ui/gfx/point_f.h"
 #include "url/gurl.h"
 
 namespace content {
@@ -47,6 +48,7 @@ struct CONTENT_EXPORT ExplodedFrameState {
   base::NullableString16 target;
   base::NullableString16 state_object;
   std::vector<base::NullableString16> document_state;
+  gfx::PointF pinch_viewport_scroll_offset;
   gfx::Point scroll_offset;
   int64 item_sequence_number;
   int64 document_sequence_number;