media: Verify CDM Host files

content/common/BUILD.gn

Index: content/common/BUILD.gn
diff --git a/content/common/BUILD.gn b/content/common/BUILD.gn
index cd2b8dc2c83ff082f46ad68a5451a96e3df80c2a..cd231585a7589645918928ef0500670e733f18c8 100644
--- a/content/common/BUILD.gn
+++ b/content/common/BUILD.gn
@@ -533,6 +533,23 @@ source_set("common") {
       "external_ipc_dumper.h",
     ]
   }
+
+  if (enable_pepper_cdms) {
+    sources += [
+      "media/cdm_host_file.cc",
+      "media/cdm_host_file.h",
+      "media/cdm_host_files.cc",
+      "media/cdm_host_files.h",
+    ]
+    deps += [
+      "//media:cdm_paths",
+
+      # Needed for finding CDM path from CDM adapter path.
+      # TODO(xhwang): Remove this dependency when CDM adapter is deprecated.
+      # See http://crbug.com/403462
+      "//third_party/widevine/cdm:headers",
+    ]
+  }
 }
 
 # See comment at the top of //content/BUILD.gn for how this works.