Implement Android accessible hit testing using an IPC to the renderer process.

content/browser/accessibility/browser_accessibility_manager_android.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 CONTENT_BROWSER_ACCESSIBILITY_BROWSER_ACCESSIBILITY_MANAGER_ANDROID_H_
 #define CONTENT_BROWSER_ACCESSIBILITY_BROWSER_ACCESSIBILITY_MANAGER_ANDROID_H_
 
 #include "base/android/scoped_java_ref.h"
 #include "content/browser/accessibility/browser_accessibility_manager.h"
 #include "content/browser/android/content_view_core_impl.h"
@@ skipping 25 matching lines @@
   virtual void NotifyAccessibilityEvent(
       ui::AXEvent event_type, BrowserAccessibility* node) OVERRIDE;
 
   // --------------------------------------------------------------------------
   // Methods called from Java via JNI
   // --------------------------------------------------------------------------
 
   // Tree methods.
   jint GetRootId(JNIEnv* env, jobject obj);
   jboolean IsNodeValid(JNIEnv* env, jobject obj, jint id);
-  jint HitTest(JNIEnv* env, jobject obj, jint x, jint y);
+  void HitTest(JNIEnv* env, jobject obj, jint x, jint y);
 
   // Populate Java accessibility data structures with info about a node.
   jboolean PopulateAccessibilityNodeInfo(
       JNIEnv* env, jobject obj, jobject info, jint id);
   jboolean PopulateAccessibilityEvent(
       JNIEnv* env, jobject obj, jobject event, jint id, jint event_type);
 
   // Perform actions.
   void Click(JNIEnv* env, jobject obj, jint id);
   void Focus(JNIEnv* env, jobject obj, jint id);
@@ skipping 19 matching lines @@
   // constructor.
   friend class BrowserAccessibilityManager;
 
   // A weak reference to the Java BrowserAccessibilityManager object.
   // This avoids adding another reference to BrowserAccessibilityManager and
   // preventing garbage collection.
   // Premature garbage collection is prevented by the long-lived reference in
   // ContentViewCore.
   JavaObjectWeakGlobalRef java_ref_;
 
-  // Searches through the children of start_node to find the nearest
-  // accessibility focus candidate for a touch which has not landed directly on
-  // an accessibility focus candidate.
-  BrowserAccessibility* FuzzyHitTest(
-      int x, int y, BrowserAccessibility* start_node);
-
-  static void FuzzyHitTestImpl(int x, int y, BrowserAccessibility* start_node,
-      BrowserAccessibility** nearest_candidate, int* min_distance);
-
-  // Calculates the distance from the point (x, y) to the nearest point on the
-  // edge of |node|.
-  static int CalculateDistanceSquared(int x, int y, BrowserAccessibility* node);
+  // Handle a hover event from the renderer process.
+  void HandleHoverEvent(BrowserAccessibility* node);
 
   DISALLOW_COPY_AND_ASSIGN(BrowserAccessibilityManagerAndroid);
 };
 
 bool RegisterBrowserAccessibilityManager(JNIEnv* env);
 
 }
 
 #endif  // CONTENT_BROWSER_ACCESSIBILITY_BROWSER_ACCESSIBILITY_MANAGER_ANDROID_H_