[autofill] Show autofill popup when focusing a field by tapping near its edge.

components/autofill/content/renderer/page_click_tracker.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 COMPONENTS_AUTOFILL_CONTENT_RENDERER_PAGE_CLICK_TRACKER_H_
 #define COMPONENTS_AUTOFILL_CONTENT_RENDERER_PAGE_CLICK_TRACKER_H_
 
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/memory/weak_ptr.h"
 #include "content/public/renderer/render_view_observer.h"
 #include "third_party/WebKit/public/web/WebNode.h"
 
+namespace gfx {
+class RectF;
+}
+
 namespace autofill {
 
 class PageClickListener;
 
 // This class is responsible notifying the associated listener when a node is
 // clicked or tapped. It also tracks whether a node was focused before the event
 // was handled.
 //
 // This is useful for password/form autofill where we want to trigger a
 // suggestion popup when a text input is clicked.
 //
 // There is one PageClickTracker per AutofillAgent.
 // TODO(estade): migrate to content::RenderFrameObserver.
 class PageClickTracker : public content::RenderViewObserver {
  public:
   // The |listener| will be notified when an element is clicked.  It must
   // outlive this class.
   PageClickTracker(content::RenderView* render_view,
                    PageClickListener* listener);
   ~PageClickTracker() override;
 
  private:
   // RenderView::Observer implementation.
   void OnDestruct() override;
   void DidHandleMouseEvent(const blink::WebMouseEvent& event) override;
   void DidHandleGestureEvent(const blink::WebGestureEvent& event) override;
   void FocusedNodeChanged(const blink::WebNode& node) override;
   void FocusChangeComplete() override;
 
-  // Called there is a tap or click at |x|, |y|.
-  void PotentialActivationAt(int x, int y);
+  // Called if there is a tap or click at |region|. Clicks are 1x1 regions, but
+  // taps are wider.
+  void PotentialActivationAt(const gfx::RectF& region);
 
   // The node that was clicked. Non-null only when the animations caused by
   // focus change are still ongoing.
   blink::WebNode clicked_node_;
 
   // This is set to false when the focus changes, then set back to true soon
   // afterwards. This helps track whether an event happened after a node was
   // already focused, or if it caused the focus to change.
   bool was_focused_before_now_;
 
   // The listener getting the actual notifications.
   PageClickListener* listener_;
 
   DISALLOW_COPY_AND_ASSIGN(PageClickTracker);
 };
 
 }  // namespace autofill
 
 #endif  // COMPONENTS_AUTOFILL_CONTENT_RENDERER_PAGE_CLICK_TRACKER_H_