Allow Secure Stops to be queried and deleted by application ID

This CL changes the WVDrmPlugin so that an application can segregate
its secure stops from those of other applications by setting an
application ID.

This CL is a merge of the following Widevine CLs:
https://widevine-internal-review.googlesource.com/#/c/11565/
Add getSecureStop by ssid

https://widevine-internal-review.googlesource.com/#/c/11572
Add getSecureStop by SSID and releaseAllSecureStops by app id.

https://widevine-internal-review.googlesource.com/#/c/11564/
Store Usage Info by App Id (device_file stubs)

https://widevine-internal-review.googlesource.com/#/c/11563/
Add application id to StoreUsageInfo.

https://widevine-internal-review.googlesource.com/#/c/11561/
Added Application ID to PropertySet for secure stop.

bug: 18053197
bug: 18076411
Change-Id: I5444baf67ba1b960dee2dc958bced8de82ab70a3

libwvdrmengine/mediadrm/include/WVDrmPlugin.h

@@ -85,8 +85,13 @@ class WVDrmPlugin : public android::DrmPlugin,
 
   virtual status_t unprovisionDevice();
 
+  virtual status_t getSecureStop(const Vector<uint8_t>& ssid,
+                                 Vector<uint8_t>& secureStop);
+
   virtual status_t getSecureStops(List<Vector<uint8_t> >& secureStops);
 
+  virtual status_t releaseAllSecureStops();
+
   virtual status_t releaseSecureStops(const Vector<uint8_t>& ssRelease);
 
   virtual status_t getPropertyString(const String8& name, String8& value) const;
@@ -219,6 +224,14 @@ class WVDrmPlugin : public android::DrmPlugin,
       mSessionSharingId = id;
     }
 
+    virtual const std::string& app_id() const {
+      return mAppId;
+    }
+
+    void set_app_id(const std::string& appId) {
+      mAppId = appId;
+    }
+
    private:
     DISALLOW_EVIL_CONSTRUCTORS(WVClientPropertySet);
 
@@ -227,6 +240,7 @@ class WVDrmPlugin : public android::DrmPlugin,
     std::string mServiceCertificate;
     bool mShareKeys;
     uint32_t mSessionSharingId;
+    std::string mAppId;
   } mPropertySet;
 
   WvContentDecryptionModule* mCDM;