Add widevine third party

Add 2 new command options to use widevine:
- widevine-cdm-path: Path to widevine plugin
- widevine-cdm-version: Version of the widevine plugin

atom/renderer/atom_renderer_client.cc

@@ -5,6 +5,7 @@
 #include "atom/renderer/atom_renderer_client.h"
 
 #include <string>
+#include <vector>
 
 #include "atom/common/api/api_messages.h"
 #include "atom/common/api/atom_bindings.h"
@@ -15,6 +16,7 @@
 #include "atom/renderer/guest_view_container.h"
 #include "atom/renderer/node_array_buffer_bridge.h"
 #include "base/command_line.h"
+#include "chrome/renderer/media/chrome_key_systems.h"
 #include "chrome/renderer/pepper/pepper_helper.h"
 #include "chrome/renderer/printing/print_web_view_helper.h"
 #include "chrome/renderer/tts_dispatcher.h"
@@ -234,4 +236,9 @@ void AtomRendererClient::EnableWebRuntimeFeatures() {
     blink::WebRuntimeFeatures::enableSharedWorker(true);
 }
 
+void AtomRendererClient::AddKeySystems(
+  std::vector<media::KeySystemInfo>* key_systems) {
+  AddChromeKeySystems(key_systems);
+}
+
 }  // namespace atom

atom/renderer/atom_renderer_client.h

@@ -6,6 +6,7 @@
 #define ATOM_RENDERER_ATOM_RENDERER_CLIENT_H_
 
 #include <string>
+#include <vector>
 
 #include "content/public/renderer/content_renderer_client.h"
 #include "content/public/renderer/render_process_observer.h"
@@ -58,7 +59,7 @@ class AtomRendererClient : public content::ContentRendererClient,
   bool ShouldOverridePageVisibilityState(
       const content::RenderFrame* render_frame,
       blink::WebPageVisibilityState* override_state) override;
-
+  void AddKeySystems(std::vector<media::KeySystemInfo>* key_systems) override;
   void EnableWebRuntimeFeatures();
 
   scoped_ptr<NodeBindings> node_bindings_;