Resolve lint warnings related to ClickableViewAccessibility when a class overrides onTouch event.

content/public/android/java/src/org/chromium/content/browser/PopupZoomer.java

Index: content/public/android/java/src/org/chromium/content/browser/PopupZoomer.java
diff --git a/content/public/android/java/src/org/chromium/content/browser/PopupZoomer.java b/content/public/android/java/src/org/chromium/content/browser/PopupZoomer.java
index 80e7dd2de997365a55ce06b5d4118ee36688d784..908493cad03c20ab18696c3ae4bb168afa0f8efe 100644
--- a/content/public/android/java/src/org/chromium/content/browser/PopupZoomer.java
+++ b/content/public/android/java/src/org/chromium/content/browser/PopupZoomer.java
@@ -81,6 +81,7 @@ class PopupZoomer extends View {
     private boolean mAnimating = false;
     private boolean mShowing = false;
     private long mAnimationStartTime = 0;
+    private boolean mDownTouch = false;
 
     // The time that was left for the outwards animation to finish.
     // This is used in the case that the zoomer is cancelled while it is still animating outwards,
@@ -541,6 +542,25 @@ class PopupZoomer extends View {
     @Override
     public boolean onTouchEvent(MotionEvent event) {
         mGestureDetector.onTouchEvent(event);
+        // Listening for the down and up touch events
+        // to enable accessibility services for a user
+        // who cannot click touch screen.
+        switch (event.getAction()) {
+        case MotionEvent.ACTION_DOWN:
+            mDownTouch = true;
+            break;
+        case MotionEvent.ACTION_UP:
+            if (mDownTouch) {
+                mDownTouch = false;
+                performClick();
+            }
+        }
+        return true;
+    }
+
+    @Override
+    public boolean performClick() {
+        super.performClick();
         return true;
     }