Don't use the touch rect when targetting above the touch handles

ui/touch_selection/touch_handle.cc

 // Copyright 2014 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.
 
 #include "ui/touch_selection/touch_handle.h"
 
 #include <cmath>
 
 namespace ui {
 
@@ skipping 142 matching lines @@
     return false;
 
   switch (event.GetAction()) {
     case MotionEvent::ACTION_DOWN: {
       if (!is_visible_)
         return false;
       const gfx::PointF touch_point(event.GetX(), event.GetY());
       const float touch_radius = std::max(
           kMinTouchMajorForHitTesting,
           std::min(kMaxTouchMajorForHitTesting, event.GetTouchMajor())) * 0.5f;
-      if (!RectIntersectsCircle(drawable_->GetVisibleBounds(),
-                                touch_point,
-                                touch_radius)) {
+      const gfx::RectF drawable_bounds = drawable_->GetVisibleBounds();
+      // Only use the touch radius for targetting if the touch is at or below
+      // the drawable area. This makes it easier to interact with the line of
+      // text above the drawable.
+      if (touch_point.y() < drawable_bounds.y() ||
+          !RectIntersectsCircle(drawable_bounds, touch_point, touch_radius)) {
         EndDrag();
         return false;
       }
       touch_down_position_ = touch_point;
       touch_drag_offset_ = position_ - touch_down_position_;
       touch_down_time_ = event.GetEventTime();
       BeginDrag();
     } break;
 
     case MotionEvent::ACTION_MOVE: {
@@ skipping 118 matching lines @@
 
 void TouchHandle::SetAlpha(float alpha) {
   alpha = std::max(0.f, std::min(1.f, alpha));
   if (alpha_ == alpha)
     return;
   alpha_ = alpha;
   drawable_->SetAlpha(alpha);
 }
 
 }  // namespace ui