WebCrypto: Add interfaces for importKey().

Tools/DumpRenderTree/chromium/TestRunner/src/WebTestInterfaces.cpp

Index: Tools/DumpRenderTree/chromium/TestRunner/src/WebTestInterfaces.cpp
diff --git a/Tools/DumpRenderTree/chromium/TestRunner/src/WebTestInterfaces.cpp b/Tools/DumpRenderTree/chromium/TestRunner/src/WebTestInterfaces.cpp
index 5f34563c965debc6146c6500ddb18a3792849f86..18cea204fea45e8a6a0ff12eeca598fbdd3036dd 100644
--- a/Tools/DumpRenderTree/chromium/TestRunner/src/WebTestInterfaces.cpp
+++ b/Tools/DumpRenderTree/chromium/TestRunner/src/WebTestInterfaces.cpp
@@ -31,6 +31,7 @@
 #include "public/testing/WebTestInterfaces.h"
 
 #include "MockWebAudioDevice.h"
+#include "MockWebCrypto.h"
 #include "MockWebMIDIAccessor.h"
 #include "MockWebMediaStreamCenter.h"
 #include "MockWebRTCPeerConnectionHandler.h"
@@ -115,4 +116,9 @@ WebAudioDevice* WebTestInterfaces::createAudioDevice(double sampleRate)
     return new MockWebAudioDevice(sampleRate);
 }
 
+WebCrypto* WebTestInterfaces::crypto()
+{
+    return MockWebCrypto::get();
+}
+
 }