[Chromecast] Add CastMediaBlocker and BrowserTest

media/test/data/player.html

Index: media/test/data/player.html
diff --git a/media/test/data/player.html b/media/test/data/player.html
index fa50d731e1a3610e1f9db825f5cb6f104bb072df..a1f46392928fc983cacc00579ae129b0ae7b3f35 100644
--- a/media/test/data/player.html
+++ b/media/test/data/player.html
@@ -38,23 +38,46 @@ function SeekTestTimeoutSetup() {
 }
 
 // Uses URL query parameters to create an audio or video element using a given
-// source.  URL must be of the form "player.html?[tag]=[media_url]".  Plays the
-// media and waits for X seconds of playback or the ended event, at which point
-// the test seeks near the end of the file and resumes playback.  Test completes
-// when the second ended event occurs or an error event occurs at any time.
+// source.  URL must be of the form:
+// "player.html?[tag]=[media_url][&loop=[true/false]]".
+//
+// Plays the media and waits for X seconds of playback or the ended event, at
+// which point the test seeks near the end of the file and resumes playback.
+// Test completes when the second ended event occurs or an error event occurs at
+// any time.
+// There is an optional loop query parameter which when set to true, will cause
+// the created media element to loop.
 function RunTest() {
   var url_parts = window.location.href.split('?');
   if (url_parts.length != 2)
     return Failed();
 
-  var query_parts = url_parts[1].split('=');
-  if (query_parts.length != 2)
-    return Failed();
-
-  var tag = query_parts[0];
-  var media_url = query_parts[1];
-  if (tag != 'audio' && tag != 'video')
+  var tag = '';
+  var media_url = '';
+  var loop = false;
+
+  var query_params = url_parts[1].split('&');
+  for (var query_param in query_params) {
+    var query_parts = query_params[query_param].split('=');
+    if (query_parts.length != 2) {
+      return Failed();
+    }
+
+    if (query_parts[0] == 'audio' || query_parts[0] == 'video') {
+      tag = query_parts[0];
+      media_url = query_parts[1];
+      continue;
+    }
+
+    if (query_parts[0] == 'loop') {
+      loop = (query_parts[1] == 'true');
+      continue;
+    }
+  }
+
+  if (tag != 'audio' && tag != 'video') {
     return Failed();
+  }
 
   // Create player and insert into DOM.
   player = document.createElement(tag);
@@ -74,6 +97,7 @@ function RunTest() {
   InstallTitleEventHandler(player, 'error');
 
   // Starts the player.
+  player.loop = loop;
   player.src = media_url;
   player.play();
 }