Add testing feature to disable MediaDrm provisioning

If the feature "FailUrlProvisionFetcherForTesting" is enabled,
all MediaDrm provisioning requests will not be sent to the provisioning
server and will respond as if the request failed.

BUG=954541
TEST=tested manually

Change-Id: I9606e05671d1ffaede8743a150ebe67cfbfb2836
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1576121
Commit-Queue: John Rummell <jrummell@chromium.org>
Reviewed-by: Xiaohan Wang <xhwang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#653329}

chrome/browser/media/android/cdm/media_drm_origin_id_manager_unittest.cc

@@ -151,6 +151,8 @@ TEST_F(MediaDrmOriginIdManagerTest, DisablePreProvisioningAtStartup) {
 
   EXPECT_FALSE(
       base::FeatureList::IsEnabled(media::kMediaDrmPreprovisioningAtStartup));
+  EXPECT_FALSE(
+      base::FeatureList::IsEnabled(media::kFailUrlProvisionFetcherForTesting));
 
   test_browser_thread_bundle_.RunUntilIdle();
 

content/browser/media/url_provision_fetcher.cc

@@ -7,6 +7,7 @@
 #include "base/bind.h"
 #include "content/public/browser/provision_fetcher_factory.h"
 #include "media/base/bind_to_current_loop.h"
+#include "media/base/media_switches.h"
 #include "net/base/load_flags.h"
 #include "net/traffic_annotation/network_traffic_annotation.h"
 #include "services/network/public/cpp/resource_request.h"
@@ -29,6 +30,13 @@ void URLProvisionFetcher::Retrieve(
     const std::string& default_url,
     const std::string& request_data,
     const media::ProvisionFetcher::ResponseCB& response_cb) {
+  // For testing, don't actually do provisioning if the feature is enabled,
+  // just indicate that the request failed.
+  if (base::FeatureList::IsEnabled(media::kFailUrlProvisionFetcherForTesting)) {
+    response_cb.Run(false, std::string());
+    return;
+  }
+
   response_cb_ = response_cb;
 
   const std::string request_string =

media/base/media_switches.cc

@@ -326,6 +326,13 @@ const base::Feature kVideoBlitColorAccuracy{"video-blit-color-accuracy",
 const base::Feature kExternalClearKeyForTesting{
     "ExternalClearKeyForTesting", base::FEATURE_DISABLED_BY_DEFAULT};
 
+// Prevents UrlProvisionFetcher from making a provisioning request. If
+// specified, any provisioning request made will not be sent to the provisioning
+// server, and the response will indicate a failure to communicate with the
+// provisioning server.
+const base::Feature kFailUrlProvisionFetcherForTesting{
+    "FailUrlProvisionFetcherForTesting", base::FEATURE_DISABLED_BY_DEFAULT};
+
 // Enables hardware secure decryption if supported by hardware and CDM.
 // TODO(xhwang): Currently this is only used for development of new features.
 // Apply this to Android and ChromeOS as well where hardware secure decryption

media/base/media_switches.h

@@ -102,6 +102,7 @@ MEDIA_EXPORT extern const base::Feature kBackgroundVideoPauseOptimization;
 MEDIA_EXPORT extern const base::Feature kD3D11VideoDecoder;
 MEDIA_EXPORT extern const base::Feature kD3D11VideoDecoderIgnoreWorkarounds;
 MEDIA_EXPORT extern const base::Feature kExternalClearKeyForTesting;
+MEDIA_EXPORT extern const base::Feature kFailUrlProvisionFetcherForTesting;
 MEDIA_EXPORT extern const base::Feature kFallbackAfterDecodeError;
 MEDIA_EXPORT extern const base::Feature kHardwareMediaKeyHandling;
 MEDIA_EXPORT extern const base::Feature kHardwareSecureDecryption;