Add Promises for EME (Chromium side)

Now that the EME-WD spec has changed to specify promises, implement
them on the Chromium side. They currently get converted back to
events before passing them to blink:: until the blink interface gets
changed.

Additional changes in this CL:
1. Pass a reference to the promise though PPAPI.
2. Roll DEPS for CDM.h to include CDM_5.
3. Update cdm_adapter to use CDM_5 (in addition to existing CDM_4).
4. Change External Clear Key to use CDM_5.
5. Since CDM_5 references sessions by the actual session id (a string,
   web_session_id), switch to using it rather than the previously used
   session_id (which is an integer, and used as a reference).

BUG=358271
TEST=all existing encrypted media layout and browser tests pass

Review URL: https://codereview.chromium.org/265993002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@275656 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 1 insertions, 1 deletions

diff --git a/DEPS b/DEPS
index 37c1efb..096aedb 100644
--- a/DEPS
+++ b/DEPS
@@ -294,7 +294,7 @@ deps = {
     "/trunk/deps/third_party/opus@256783",
 
   "src/media/cdm/ppapi/api":
-    "/trunk/deps/cdm@262570",
+    "/trunk/deps/cdm@273356",
 
   "src/third_party/mesa/src":
     "/trunk/deps/third_party/mesa@265279",