screenshot disabling policy

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 "chrome/browser/browser_process.h"
+#include "chrome/test/base/testing_browser_process.h"
+#include "chrome/test/base/testing_pref_service.h"
 #include "testing/platform_test.h"
 #include "ui/gfx/rect.h"
 
 namespace chrome {
 namespace {
 
 typedef PlatformTest GrabWindowSnapshotTest;
 
 TEST_F(GrabWindowSnapshotTest, TestGrabWindowSnapshot) {
+  // GrabWindowSnapshot reads local state, so set it up
+  ScopedTestingLocalState local_state(
+    static_cast<TestingBrowserProcess*>(g_browser_process));
+
   // 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];
 
@@ skipping 10 matching lines @@
   EXPECT_TRUE([rep isKindOfClass:[NSBitmapImageRep class]]);
   EXPECT_TRUE(CGImageGetWidth([rep CGImage]) == 400);
   NSColor* color = [rep colorAtX:200 y:200];
   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