Move webcrypto to child/ and add support to worker_webkitplatformsupport.

content/child/webkitplatformsupport_impl.cc

Index: content/child/webkitplatformsupport_impl.cc
diff --git a/content/child/webkitplatformsupport_impl.cc b/content/child/webkitplatformsupport_impl.cc
index 13b2603d2c7b0b6f7dce4ebbbc8ff00b38c7e7b5..99b1632f3648a085209dfa7780a6c1f782c2bee6 100644
--- a/content/child/webkitplatformsupport_impl.cc
+++ b/content/child/webkitplatformsupport_impl.cc
@@ -5,6 +5,7 @@
 #include "base/command_line.h"
 #include "content/child/child_thread.h"
 #include "content/child/socket_stream_dispatcher.h"
+#include "content/child/webcrypto/webcrypto_impl.h"
 #include "content/child/webkitplatformsupport_impl.h"
 #include "content/child/websocket_bridge.h"
 #include "content/public/common/content_client.h"
@@ -46,4 +47,10 @@ blink::WebSocketHandle* WebKitPlatformSupportImpl::createWebSocketHandle() {
   return new WebSocketBridge;
 }
 
+blink::WebCrypto* WebKitPlatformSupportImpl::crypto() {
+  if (!web_crypto_)
+    web_crypto_.reset(new WebCryptoImpl());
+  return web_crypto_.get();
+}
+
 }  // namespace content