Fixing a cursor position initialization problem

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

 // Copyright 2015 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.graphics.Matrix;
 import android.graphics.PointF;
 import android.graphics.Rect;
 import android.graphics.RectF;
@@ skipping 60 matching lines @@
                 viewportCenter.y = bounds.bottom;
             }
 
             mViewportPosition.set(viewportCenter);
         }
 
         return viewportCenter;
     }
 
     /**
+     * Sets the desired center position of the viewport.
+     *
+     * @param newX The new x coordinate value for the desired center position.
+     * @param newY The new y coordinate value for the desired center position.
+     */
+    public void setViewportPosition(float newX, float newY) {
+        synchronized (mRenderData) {
+            mViewportPosition.set(newX, newY);
+        }
+    }
+
+    /**
      * Returns the current size of the viewport.  This size includes the offset calculations for
      * any visible system UI.
      *
      * @return A point representing the current size of the viewport.
      */
     private PointF getViewportSize() {
         float adjustedScreenWidth, adjustedScreenHeight;
         synchronized (mRenderData) {
             adjustedScreenWidth = mRenderData.screenWidth - mSystemUiOffsetPixels.right;
             adjustedScreenHeight = mRenderData.screenHeight - mSystemUiOffsetPixels.bottom;
@@ skipping 153 matching lines @@
                 // level needed to fit either the width or height.
                 float scale = Math.min((float) mRenderData.screenWidth / mRenderData.imageWidth,
                                        (float) mRenderData.screenHeight / mRenderData.imageHeight);
                 mRenderData.transform.setScale(scale, scale);
             }
         }
 
         repositionImage(centerViewport);
     }
 }