Add basic video support to mojo html_viewer

mojo/services/html_viewer/webmimeregistry_impl.cc

 // Copyright 2014 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 "mojo/services/html_viewer/webmimeregistry_impl.h"
 
 #include "base/files/file_path.h"
 #include "base/strings/string_util.h"
 #include "base/strings/sys_string_conversions.h"
 #include "base/strings/utf_string_conversions.h"
@@ skipping 40 matching lines @@
     const blink::WebString& mime_type) {
   return net::IsSupportedJavascriptMimeType(ToASCIIOrEmpty(mime_type)) ?
       blink::WebMimeRegistry::IsSupported :
       blink::WebMimeRegistry::IsNotSupported;
 }
 
 blink::WebMimeRegistry::SupportsType WebMimeRegistryImpl::supportsMediaMIMEType(
     const blink::WebString& mime_type,
     const blink::WebString& codecs,
     const blink::WebString& key_system) {
-  NOTIMPLEMENTED();
-  return IsNotSupported;
+  const std::string mime_type_ascii = ToASCIIOrEmpty(mime_type);
+  // Not supporting the container is a flat-out no.
+  if (!net::IsSupportedMediaMimeType(mime_type_ascii))
+    return IsNotSupported;
+
+  // Mojo does not currently support any key systems.
+  if (!key_system.isEmpty())
+    return IsNotSupported;
+
+  // Check list of strict codecs to see if it is supported.
+  if (net::IsStrictMediaMimeType(mime_type_ascii)) {
+    // Check if the codecs are a perfect match.
+    std::vector<std::string> strict_codecs;
+    net::ParseCodecString(ToASCIIOrEmpty(codecs), &strict_codecs, false);
+    return static_cast<WebMimeRegistry::SupportsType>(
+        net::IsSupportedStrictMediaMimeType(mime_type_ascii, strict_codecs));
+  }
+
+  // If we don't recognize the codec, it's possible we support it.
+  std::vector<std::string> parsed_codecs;
+  net::ParseCodecString(ToASCIIOrEmpty(codecs), &parsed_codecs, true);
+  if (!net::AreSupportedMediaCodecs(parsed_codecs))
+    return MayBeSupported;
+
+  // Otherwise we have a perfect match.
+  return IsSupported;
 }
 
 bool WebMimeRegistryImpl::supportsMediaSourceMIMEType(
     const blink::WebString& mime_type,
     const blink::WebString& codecs) {
   NOTIMPLEMENTED();
   return false;
 }
 
 bool WebMimeRegistryImpl::supportsEncryptedMediaMIMEType(
@@ skipping 24 matching lines @@
   return blink::WebString();
 }
 
 blink::WebString WebMimeRegistryImpl::mimeTypeFromFile(
     const blink::WebString& file_path) {
   NOTIMPLEMENTED();
   return blink::WebString();
 }
 
 }  // namespace mojo