Fix various errorprone warnings and errors.

remoting/android/java/src/org/chromium/chromoting/TrackingInputHandler.java

 // 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.
 
 package org.chromium.chromoting;
 
 import android.content.Context;
 import android.graphics.Matrix;
 import android.graphics.PointF;
 import android.view.GestureDetector;
@@ skipping 10 matching lines @@
      * values here will result in more frequent canvas redraws during zooming.
      */
     private static final double MIN_ZOOM_DELTA = 0.05;
 
     /**
      * Maximum allowed zoom level - see {@link #repositionImageWithZoom()}.
      */
     private static final float MAX_ZOOM_FACTOR = 100.0f;
 
     private DesktopViewInterface mViewer;
-    private RenderData mRenderData;
+    private final RenderData mRenderData;
 
     private GestureDetector mScroller;
     private ScaleGestureDetector mZoomer;
     private TapGestureDetector mTapDetector;
 
     /** Used to calculate the physics for flinging the cursor. */
     private Scroller mFlingScroller;
 
     /** Used to disambiguate a 2-finger gesture as a swipe or a pinch. */
     private SwipePinchDetector mSwipePinchDetector;
@@ skipping 409 matching lines @@
         public void onLongPress(int pointerCount) {
             mHeldButton = mouseButtonFromPointerCount(pointerCount);
             if (mHeldButton != BUTTON_UNDEFINED) {
                 injectButtonEvent(mHeldButton, true);
                 mViewer.showLongPressFeedback();
                 mSuppressFling = true;
             }
         }
     }
 }