Add support for redirecting ResourceHandlers to a blob: URL

content/browser/streams/chrome_stream_context.cc

+// Copyright (c) 2013 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/browser/streams/chrome_stream_context.h"
+
+#include "base/bind.h"
+#include "content/browser/streams/chrome_stream_registry.h"
+#include "content/public/browser/browser_context.h"
+#include "content/public/browser/browser_thread.h"
+
+using base::UserDataAdapter;
+
+namespace content {
+
+static const char* kStreamContextKeyName = "content_stream_context";
+
+ChromeStreamContext::ChromeStreamContext() {}
+
+ChromeStreamContext* ChromeStreamContext::GetFor(
+    BrowserContext* context) {
+  if (!context->GetUserData(kStreamContextKeyName)) {
+    scoped_refptr<ChromeStreamContext> blob =
+        new ChromeStreamContext();
+    context->SetUserData(kStreamContextKeyName,
+                         new UserDataAdapter<ChromeStreamContext>(blob));
+    // Check first to avoid memory leak in unittests.
+    if (BrowserThread::IsMessageLoopValid(BrowserThread::IO)) {
+      BrowserThread::PostTask(
+          BrowserThread::IO, FROM_HERE,
+          base::Bind(&ChromeStreamContext::InitializeOnIOThread, blob));
+    }
+  }
+
+  return UserDataAdapter<ChromeStreamContext>::Get(
+      context, kStreamContextKeyName);
+}
+
+void ChromeStreamContext::InitializeOnIOThread() {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
+  registry_.reset(new ChromeStreamRegistry());
+}
+
+ChromeStreamContext::~ChromeStreamContext() {}
+
+void ChromeStreamContext::DeleteOnCorrectThread() const {
+  if (BrowserThread::IsMessageLoopValid(BrowserThread::IO) &&
+      !BrowserThread::CurrentlyOn(BrowserThread::IO)) {
+    BrowserThread::DeleteSoon(BrowserThread::IO, FROM_HERE, this);
+    return;
+  }
+  delete this;
+}
+
+}  // namespace content