<webview>: Move PreHandleGestureEvent in chrome

chrome/browser/guest_view/guest_view_base.cc

Index: chrome/browser/guest_view/guest_view_base.cc
diff --git a/chrome/browser/guest_view/guest_view_base.cc b/chrome/browser/guest_view/guest_view_base.cc
index 574730522f5ef44db091f2eee10946697244598d..274270f43878f02f87e232234139f9c3594e638c 100644
--- a/chrome/browser/guest_view/guest_view_base.cc
+++ b/chrome/browser/guest_view/guest_view_base.cc
@@ -16,6 +16,7 @@
 #include "content/public/common/url_constants.h"
 #include "extensions/browser/event_router.h"
 #include "net/base/escape.h"
+#include "third_party/WebKit/public/web/WebInputEvent.h"
 
 using content::WebContents;
 
@@ -189,6 +190,13 @@ void GuestViewBase::RegisterDestructionCallback(
   destruction_callback_ = callback;
 }
 
+bool GuestViewBase::PreHandleGestureEvent(content::WebContents* source,
+                                         const blink::WebGestureEvent& event) {
+  return event.type == blink::WebGestureEvent::GesturePinchBegin ||
+      event.type == blink::WebGestureEvent::GesturePinchUpdate ||
+      event.type == blink::WebGestureEvent::GesturePinchEnd;
+}
+
 GuestViewBase::~GuestViewBase() {
   std::pair<int, int> key(embedder_render_process_id_, guest_instance_id_);