Media Stream Image Capture (4): wire takePhoto and implement in FakeVCDevice

third_party/WebKit/Source/modules/imagecapture/ImageCapture.cpp

 // Copyright 2016 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 "modules/imagecapture/ImageCapture.h"
 
 #include "bindings/core/v8/CallbackPromiseAdapter.h"
 #include "bindings/core/v8/ScriptPromiseResolver.h"
 #include "core/dom/DOMException.h"
 #include "core/dom/ExceptionCode.h"
@@ skipping 124 matching lines @@
     Platform::current()->serviceRegistry()->connectToRemoteService(mojo::GetProxy(&m_service));
 
     m_service.set_connection_error_handler(createBaseCallback(bind(&ImageCapture::onServiceConnectionError, WeakPersistentThisPointer<ImageCapture>(this))));
 }
 
 void ImageCapture::onTakePhoto(ScriptPromiseResolver* resolver, const String& mimeType, mojo::WTFArray<uint8_t> data)
 {
     if (!m_serviceRequests.contains(resolver))
         return;
 
-    DCHECK(!data.is_null());
-    const auto& storage = data.storage();
-    resolver->resolve(Blob::create(storage.data(), storage.size(), mimeType));
+    if (data.is_null() || data.empty()) {
+        resolver->reject(DOMException::create(UnknownError, "platform error"));
+    } else {
+        const auto& storage = data.storage();
+        resolver->resolve(Blob::create(storage.data(), storage.size(), mimeType));
+    }
     m_serviceRequests.remove(resolver);
 }
 
 void ImageCapture::onServiceConnectionError()
 {
     m_service.reset();
     for (ScriptPromiseResolver* resolver : m_serviceRequests)
         resolver->reject(DOMException::create(NotFoundError, kNoServiceError));
     m_serviceRequests.clear();
 }
 
 DEFINE_TRACE(ImageCapture)
 {
     visitor->trace(m_streamTrack);
     visitor->trace(m_serviceRequests);
     EventTargetWithInlineData::trace(visitor);
     ContextLifecycleObserver::trace(visitor);
 }
 
 } // namespace blink