Implement the Stream registry in content

This is the first part of the content side of the Streams api.
See:
https://bugs.webkit.org/show_bug.cgi?id=110194
https://dvcs.w3.org/hg/streams-api/raw-file/tip/Overview.htm

BUG=171585


Review URL: https://chromiumcodereview.appspot.com/12335087

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@187230 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 44 insertions, 0 deletions

diff --git a/content/browser/streams/stream_context.cc b/content/browser/streams/stream_context.cc
new file mode 100644
index 0000000..ca77df1
--- /dev/null
+++ b/content/browser/streams/stream_context.cc
@@ -0,0 +1,44 @@
+// 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/stream_context.h"
+
+#include "base/bind.h"
+#include "content/browser/streams/stream_registry.h"
+#include "content/public/browser/browser_context.h"
+
+using base::UserDataAdapter;
+
+namespace {
+const char* kStreamContextKeyName = "content_stream_context";
+}
+
+namespace content {
+
+StreamContext::StreamContext() {}
+
+StreamContext* StreamContext::GetFor(BrowserContext* context) {
+  if (!context->GetUserData(kStreamContextKeyName)) {
+    scoped_refptr<StreamContext> stream = new StreamContext();
+    context->SetUserData(kStreamContextKeyName,
+                         new UserDataAdapter<StreamContext>(stream));
+    // Check first to avoid memory leak in unittests.
+    if (BrowserThread::IsMessageLoopValid(BrowserThread::IO)) {
+      BrowserThread::PostTask(
+          BrowserThread::IO, FROM_HERE,
+          base::Bind(&StreamContext::InitializeOnIOThread, stream));
+    }
+  }
+
+  return UserDataAdapter<StreamContext>::Get(context, kStreamContextKeyName);
+}
+
+void StreamContext::InitializeOnIOThread() {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
+  registry_.reset(new StreamRegistry());
+}
+
+StreamContext::~StreamContext() {}
+
+}  // namespace content