media: Verify CDM Host files

media/base/media_switches.cc

Index: media/base/media_switches.cc
diff --git a/media/base/media_switches.cc b/media/base/media_switches.cc
index 5299efe7794b19241204fbc1ecaf68ee281732eb..0bfa57277cfa9a11e8a11699141a2d675823e2d5 100644
--- a/media/base/media_switches.cc
+++ b/media/base/media_switches.cc
@@ -126,6 +126,12 @@ const char kForceVideoOverlays[] = "force-video-overlays";
 const char kMSEAudioBufferSizeLimit[] = "mse-audio-buffer-size-limit";
 const char kMSEVideoBufferSizeLimit[] = "mse-video-buffer-size-limit";
 
+// By default, if any CDM host (including signature) file is missing, the CDM
+// will not be called to verify the host. Enable this switch to ignore missing
+// CDM host files for testing purpose.
+const char kIgnoreMissingCdmHostFileForTesting[] =
+    "ignore-missing-cdm-host-file-for-testing";
+
 }  // namespace switches
 
 namespace media {