Use a mock implementation of Platform::crypto() for layout tests.

content/renderer/renderer_webkitplatformsupport_impl.cc

 // 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 "content/renderer/renderer_webkitplatformsupport_impl.h"
 
 #include "base/command_line.h"
 #include "base/files/file_path.h"
 #include "base/lazy_instance.h"
 #include "base/memory/shared_memory.h"
@@ skipping 1119 matching lines @@
 
 // static
 void RendererWebKitPlatformSupportImpl::SetMockDeviceMotionDataForTesting(
     const WebKit::WebDeviceMotionData& data) {
   g_test_device_motion_data.Get() = data;
 }
 
 //------------------------------------------------------------------------------
 
 WebKit::WebCrypto* RendererWebKitPlatformSupportImpl::crypto() {
+  // Use a mock implementation for testing in-progress work.
+  WebKit::WebCrypto* crypto =
+      GetContentClient()->renderer()->OverrideWebCrypto();
+  if (crypto)
+    return crypto;
+
   if (!web_crypto_)
     web_crypto_.reset(new WebCryptoImpl());
   return web_crypto_.get();
 
 }
 
 //------------------------------------------------------------------------------
 
 #if defined(OS_ANDROID)
 void RendererWebKitPlatformSupportImpl::vibrate(unsigned int milliseconds) {
@@ skipping 12 matching lines @@
     const WebKit::WebURL& storage_partition,
     WebKit::WebStorageQuotaType type,
     WebKit::WebStorageQuotaCallbacks* callbacks) {
   ChildThread::current()->quota_dispatcher()->QueryStorageUsageAndQuota(
       storage_partition,
       static_cast<quota::StorageType>(type),
       QuotaDispatcher::CreateWebStorageQuotaCallbacksWrapper(callbacks));
 }
 
 }  // namespace content