Make SkNSView's window accept mouseMoved events

src/views/mac/SkNSView.mm

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #import "SkNSView.h"
 #include "SkCanvas.h"
 #include "SkSurface.h"
@@ skipping 40 matching lines @@
                                           name:@"NSWindowDidChangeBackingPropertiesNotification"
                                           object:[self window]];
     if (fWind) {
         fWind->setVisibleP(true);
         NSSize size = self.frame.size;
 #if RETINA_API_AVAILABLE
         size = [self convertSizeToBacking:self.frame.size];
 #endif
         fWind->resize((int) size.width, (int) size.height,
                       kN32_SkColorType);
+        [[self window] setAcceptsMouseMovedEvents:YES];
     }
 }
 
 -(BOOL) isFlipped {
     return YES;
 }
 
 - (BOOL)acceptsFirstResponder {
     return YES;
 }
@@ skipping 349 matching lines @@
 }
 
 - (void)setVSync:(bool)enable {
     if (fGLContext) {
         GLint interval = enable ? 1 : 0;
         CGLContextObj ctx = (CGLContextObj)[fGLContext CGLContextObj];
         CGLSetParameter(ctx, kCGLCPSwapInterval, &interval);
     }
 }
 @end