Implemented GetWindowSnapshot on RenderViewImpl

chrome/browser/ui/window_snapshot/window_snapshot_mac_unittest.mm

-// Copyright (c) 2012 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.
-
-#include "chrome/browser/ui/window_snapshot/window_snapshot.h"
-
-#import <Cocoa/Cocoa.h>
-
-#include "base/memory/scoped_nsobject.h"
-#include "base/memory/scoped_ptr.h"
-#include "testing/platform_test.h"
-#include "ui/gfx/rect.h"
-
-#if !defined(MAC_OS_X_VERSION_10_7) || \
-    MAC_OS_X_VERSION_MAX_ALLOWED < MAC_OS_X_VERSION_10_7
-
-@interface NSWindow (LionAPI)
-- (CGFloat)backingScaleFactor;
-@end
-
-#endif  // 10.7
-
-namespace chrome {
-namespace {
-
-typedef PlatformTest GrabWindowSnapshotTest;
-
-TEST_F(GrabWindowSnapshotTest, TestGrabWindowSnapshot) {
-  // Launch a test window so we can take a snapshot.
-  NSRect frame = NSMakeRect(0, 0, 400, 400);
-  scoped_nsobject<NSWindow> window(
-      [[NSWindow alloc] initWithContentRect:frame
-                                  styleMask:NSBorderlessWindowMask
-                                    backing:NSBackingStoreBuffered
-                                      defer:NO]);
-  [window setBackgroundColor:[NSColor whiteColor]];
-  [window makeKeyAndOrderFront:NSApp];
-
-  scoped_ptr<std::vector<unsigned char> > png_representation(
-      new std::vector<unsigned char>);
-  gfx::Rect bounds = gfx::Rect(0, 0, frame.size.width, frame.size.height);
-  EXPECT_TRUE(internal::GrabWindowSnapshot(window, png_representation.get(),
-                                           bounds));
-
-  // Copy png back into NSData object so we can make sure we grabbed a png.
-  scoped_nsobject<NSData> image_data(
-      [[NSData alloc] initWithBytes:&(*png_representation)[0]
-                             length:png_representation->size()]);
-  NSBitmapImageRep* rep = [NSBitmapImageRep imageRepWithData:image_data.get()];
-  EXPECT_TRUE([rep isKindOfClass:[NSBitmapImageRep class]]);
-  CGFloat scaleFactor = 1.0f;
-  if ([window respondsToSelector:@selector(backingScaleFactor)])
-    scaleFactor = [window backingScaleFactor];
-  EXPECT_EQ(400 * scaleFactor, CGImageGetWidth([rep CGImage]));
-  NSColor* color = [rep colorAtX:200 * scaleFactor y:200 * scaleFactor];
-  CGFloat red = 0, green = 0, blue = 0, alpha = 0;
-  [color getRed:&red green:&green blue:&blue alpha:&alpha];
-  EXPECT_GE(red + green + blue, 3.0);
-}
-
-}  // namespace
-}  // namespace chrome