media: Add MediaDrmStorage

chrome/browser/media/android/cdm/media_drm_storage_factory.cc

+// Copyright 2017 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 "chrome/browser/media/android/cdm/media_drm_storage_factory.h"
+
+#include <utility>
+
+#include "base/logging.h"
+#include "base/memory/ptr_util.h"
+#include "chrome/browser/profiles/profile.h"
+#include "components/cdm/browser/media_drm_storage_impl.h"
+#include "components/prefs/pref_service.h"
+#include "content/public/browser/browser_context.h"
+#include "content/public/browser/browser_thread.h"
+#include "content/public/browser/render_frame_host.h"
+#include "content/public/browser/web_contents.h"
+#include "mojo/public/cpp/bindings/strong_binding.h"
+
+namespace chrome {
+
+void CreateMediaDrmStorage(content::RenderFrameHost* render_frame_host,
+                           media::mojom::MediaDrmStorageRequest request) {
+  DVLOG(1) << __func__;
+  DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
+  DCHECK(render_frame_host);
+
+  content::WebContents* web_contents =
+      content::WebContents::FromRenderFrameHost(render_frame_host);
+  if (!web_contents) {
+    DVLOG(1) << __func__ << ": WebContents not available.";
+    return;
+  }
+
+  content::BrowserContext* browser_context = web_contents->GetBrowserContext();
+  if (!browser_context) {
+    DVLOG(1) << __func__ << ": BrowserContext not available.";
+    return;
+  }
+
+  Profile* profile = Profile::FromBrowserContext(browser_context);
+  if (!profile) {
+    DVLOG(1) << __func__ << ": Profile not available.";

[dcheng, 2017/03/31 18:01:56]

Per chromium-dev, I think we should be DCHECKing the conditions from 30-42.

[xhwang, 2017/03/31 18:25:36]

Thanks for starting that discussion. Done!

+    return;
+  }
+
+  PrefService* pref_service = profile->GetPrefs();
+  if (!pref_service) {

[dcheng, 2017/03/31 18:01:56]

I strongly suspect this one should be a DCHECK as well.

This code is all //chrome specific, and it seems reasonable that we should be
DCHECKing that these are true (it's not commented, but it should be--and we
shouldn't be writing code that makes it seem like these invariants don't hold)

[xhwang, 2017/03/31 18:25:36]

Done.

+    DVLOG(1) << __func__ << ": PrefService not available.";
+    return;
+  }
+
+  url::Origin origin = render_frame_host->GetLastCommittedOrigin();
+  if (origin.unique()) {
+    DVLOG(1) << __func__ << ": Unique origin.";
+    return;
+  }
+
+  // The object will be deleted on connection error, or when the frame navigates
+  // away.
+  new cdm::MediaDrmStorageImpl(render_frame_host, pref_service, origin,
+                               std::move(request));
+}
+
+}  // namespace chrome