IPC messages and changes to ResourceLoaderBridge to support resource loading for media

chrome/common/render_messages_internal.h

Index: chrome/common/render_messages_internal.h
diff --git a/chrome/common/render_messages_internal.h b/chrome/common/render_messages_internal.h
index bdbabaa8e75e5137dfd0e1dcc02d7e069c4a2883..60da3326e5a78551a98802716619772912340744 100644
--- a/chrome/common/render_messages_internal.h
+++ b/chrome/common/render_messages_internal.h
@@ -174,7 +174,14 @@ IPC_BEGIN_MESSAGES(View)
                       int /* request_id */,
                       ResourceResponseHead)
 
-  // Sent as upload progress is being made
+  // Sent as download progress is being made, size of the resource may be
+  // unknown, in that case |size| is -1.
+  IPC_MESSAGE_ROUTED3(ViewMsg_Resource_DownloadProgress,
+                      int /* request_id */,
+                      int64 /* position */,
+                      int64 /* size */)
+
+  // Sent as upload progress is being made.
   IPC_MESSAGE_ROUTED3(ViewMsg_Resource_UploadProgress,
                       int /* request_id */,
                       int64 /* position */,
@@ -1110,8 +1117,13 @@ IPC_BEGIN_MESSAGES(ViewHost)
                       GURL /* last url */,
                       GURL /* url redirected to */)
 
-  // Sent when the renderer process to acknowlege receipt of and UploadProgress
-  // message.
+  // Sent by the renderer process to acknowledge receipt of a
+  // DownloadProgress message.
+  IPC_MESSAGE_ROUTED1(ViewHostMsg_DownloadProgress_ACK,
+                      int /* request_id */)
+
+  // Sent by the renderer process to acknowledge receipt of a
+  // UploadProgress message.
   IPC_MESSAGE_ROUTED1(ViewHostMsg_UploadProgress_ACK,
                       int /* request_id */)