Implement initial part of WebEmbeddedWorker

Source/web/WebEmbeddedWorkerImpl.h

Index: Source/web/WebEmbeddedWorkerImpl.h
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+/*
+ * Copyright (C) 2013 Google Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef WebEmbeddedWorkerImpl_h
+#define WebEmbeddedWorkerImpl_h
+
+#include "WebContentSecurityPolicy.h"
+#include "WebEmbeddedWorker.h"
+#include "WebEmbeddedWorkerStartData.h"
+#include "WebFrameClient.h"
+#include "core/frame/ContentSecurityPolicyResponseHeaders.h"
+#include "core/workers/WorkerLoaderProxy.h"
+
+namespace WebCore {
+class ContentSecurityPolicyResponseHeaders;
+class WorkerScriptLoader;
+class WorkerThread;
+}
+
+namespace blink {
+
+class WebView;
+
+class WebEmbeddedWorkerImpl :
+    public WebEmbeddedWorker,
+    public WebFrameClient,
+    public WebCore::WorkerLoaderProxy {
+public:
+    WebEmbeddedWorkerImpl(
+        PassOwnPtr<WebServiceWorkerContextClient>,
+        PassOwnPtr<WebWorkerPermissionClientProxy>);
+    virtual ~WebEmbeddedWorkerImpl();
+
+    // WebEmbeddedWorker overrides.
+    virtual void startWorkerContext(const WebEmbeddedWorkerStartData&) OVERRIDE;
+    virtual void terminateWorkerContext() OVERRIDE;
+
+    // WebCore::WorkerLoaderProxy overrides.

[michaeln, 2013/11/21 22:05:35]

The fact that this class implements WorkerLoaderProxy feels like an
implementation detail. If you buy that, maybe move these overrides to the
private section.

[kinuko, 2013/11/22 02:23:33]

Not really determined yet, but removed this override for now (not yet used).

+    virtual void postTaskToLoader(PassOwnPtr<WebCore::ExecutionContextTask>) OVERRIDE;
+    virtual bool postTaskForModeToWorkerGlobalScope(PassOwnPtr<WebCore::ExecutionContextTask>, const WTF::String& mode) OVERRIDE;
+
+private:
+    class Loader;
+
+    void prepareShadowPageForLoader();
+    void didLoadScriptAndStartWorkerContext();
+
+    // WebFrameClient overrides, for 'shadow page' loading.
+    virtual void didCreateDataSource(WebFrame*, WebDataSource*) OVERRIDE;
+
+    WebEmbeddedWorkerStartData m_workerStartData;
+
+    // These are kept until startWorkerContext is called, and then passed on
+    // to WorkerContext.
+    OwnPtr<WebServiceWorkerContextClient> m_workerContextClient;
+    OwnPtr<WebWorkerPermissionClientProxy> m_permissionClient;
+
+    // Kept around only while main script loading is ongoing.
+    OwnPtr<Loader> m_mainScriptLoader;
+
+    RefPtr<WebCore::WorkerThread> m_workerThread;
+
+    // 'shadow page' - created to proxy loading requests from the worker.

[michaeln, 2013/11/21 22:05:35]

This "shadow page" stuff is the technique we currently use for shared workers
and it's a good hack, we get a fully functional webcore "loader" for the bargain
basement price of the prepareShadowPageForLoader() method.

I don't know if nate &| adam can provide some pointers on a better way to cons
up a "loader". If not, I'm all for sticking with the good hack again.

+    WebView* m_webView;
+    WebFrame* m_mainFrame;
+    RefPtr<WebCore::ExecutionContext> m_loadingDocument;
+
+    bool m_askedToTerminate;
+};
+
+} // namespace blink
+
+#endif // WebEmbeddedWorkerImpl_h