Make GestureTextSelector detect its own gestures

content/browser/renderer_host/input/gesture_text_selector.h

Index: content/browser/renderer_host/input/gesture_text_selector.h
diff --git a/content/browser/renderer_host/input/gesture_text_selector.h b/content/browser/renderer_host/input/gesture_text_selector.h
index 092c30dab1238067e4ede48d5520aa46a36bfe86..4853dfe1c21693bb4d594bb44d749647b9b82dd7 100644
--- a/content/browser/renderer_host/input/gesture_text_selector.h
+++ b/content/browser/renderer_host/input/gesture_text_selector.h
@@ -7,11 +7,13 @@
 
 #include "base/gtest_prod_util.h"
 #include "base/macros.h"
+#include "base/memory/scoped_ptr.h"
 #include "base/time/time.h"
 #include "content/common/content_export.h"
+#include "ui/events/gesture_detection/gesture_listeners.h"
 
 namespace ui {
-struct GestureEventData;
+class GestureDetector;
 class MotionEvent;
 }
 
@@ -26,36 +28,38 @@ class CONTENT_EXPORT GestureTextSelectorClient {
 
   virtual void ShowSelectionHandlesAutomatically() = 0;
   virtual void SelectRange(float x1, float y1, float x2, float y2) = 0;
-  virtual void Unselect() = 0;
   virtual void LongPress(base::TimeTicks time, float x, float y) = 0;
 };
 
 // A class to handle gesture-based text selection, such as when clicking first
 // button on stylus input. It also generates a synthetic long press gesture on
 // tap so that a word can be selected or the contextual menu can be shown.
-class CONTENT_EXPORT GestureTextSelector {
+class CONTENT_EXPORT GestureTextSelector : public ui::SimpleGestureListener {
  public:
   explicit GestureTextSelector(GestureTextSelectorClient* client);
   virtual ~GestureTextSelector();
 
-  // This should be called after gesture detection but before associated
-  // gestures are dispatched. Returns whether it will consume |event|.
+  // This should be called before |event| is seen by the platform gesture
+  // detector or forwarded to web content.
   bool OnTouchEvent(const ui::MotionEvent& event);
 
-  // Returns whether it will consume the event.
-  bool OnGestureEvent(const ui::GestureEventData& gesture);
-
  private:
   friend class GestureTextSelectorTest;
   FRIEND_TEST_ALL_PREFIXES(GestureTextSelectorTest,
                            ShouldStartTextSelection);
 
+  // SimpleGestureListener implementation.
+  virtual bool OnSingleTapUp(const ui::MotionEvent& e) override;
+  virtual bool OnScroll(const ui::MotionEvent& e1,
+                        const ui::MotionEvent& e2,
+                        float distance_x,
+                        float distance_y) override;
+
   static bool ShouldStartTextSelection(const ui::MotionEvent& event);
 
   GestureTextSelectorClient* client_;
   bool text_selection_triggered_;
-  float anchor_x_;
-  float anchor_y_;
+  scoped_ptr<ui::GestureDetector> gesture_detector_;
 
   DISALLOW_COPY_AND_ASSIGN(GestureTextSelector);
 };