- Support streaming of content without .wvm extension.

If the .wvm extension is not present, the file header
  is parsed to determine if it is Widevine content.
- Fixed a missing call to OpenSession.
- Fixed unit test build.
- Fixed x86-eng build.
- This is cherry-picked from master to hc-mr1 branch
  "DO NOT MERGE"
Change-Id: Ied0579325d3c11a91f6f182fe59cd978eca68368

proprietary/drmwvmplugin/src/WVMDrmPlugin.cpp

@@ -340,7 +340,7 @@ bool WVMDrmPlugin::onCanHandle(int uniqueId, const String8& path) {
     //LOGD("WVMDrmPlugin::canHandle('%s') ", path.string());
     String8 extension = path.getPathExtension();
     extension.toLower();
-    return (String8(".wvm") == extension);
+    return (String8(".wvm") == extension || String8("") == extension);
 }
 
 /**
@@ -558,6 +558,7 @@ status_t WVMDrmPlugin::onOpenDecryptSession(
         decryptHandle->decryptApiType = DecryptApiType::WV_BASED;
         decryptHandle->status = DRM_NO_ERROR;
         decryptHandle->decryptInfo = NULL;
+        mDrmPluginImpl->OpenSession();
         result = DRM_NO_ERROR;
     } else {
         //LOGD("WVMDrmPlugin::onOpenDecryptSession - not Widevine media");
@@ -585,11 +586,7 @@ status_t WVMDrmPlugin::onOpenDecryptSession(
 
     size_t len = strlen(uri);
 
-    if ((len >= 4 && !strncmp(&uri[len - 4], ".wvm", 4)) ||
-        (strstr(uri, ".wvm?") != NULL) ||
-        (len >= 5 && !strncmp(&uri[len - 5], ".m3u8", 5)) ||
-        (strstr(uri, ".m3u8?") != NULL))
-    {
+    if (mDrmPluginImpl->IsSupportedMediaType(uri)) {
         //LOGD("WVMDrmPlugin::onOpenDecryptSession(uri) : %d - match", uniqueId);
         decryptHandle->mimeType = String8("video/wvm");
         decryptHandle->decryptApiType = DecryptApiType::WV_BASED;