Move more sources from modules.gypi to subdirectories.

third_party/WebKit/Source/modules/encryptedmedia/BUILD.gn

Index: third_party/WebKit/Source/modules/encryptedmedia/BUILD.gn
diff --git a/third_party/WebKit/Source/modules/encryptedmedia/BUILD.gn b/third_party/WebKit/Source/modules/encryptedmedia/BUILD.gn
new file mode 100644
index 0000000000000000000000000000000000000000..4b5adeae82b467ed34a48881c9485cd2dcaf1652
--- /dev/null
+++ b/third_party/WebKit/Source/modules/encryptedmedia/BUILD.gn
@@ -0,0 +1,35 @@
+# Copyright 2016 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import("//third_party/WebKit/Source/modules/modules.gni")
+
+blink_modules_sources("encryptedmedia") {
+  sources = [
+    "ContentDecryptionModuleResultPromise.cpp",
+    "ContentDecryptionModuleResultPromise.h",
+    "EncryptedMediaUtils.cpp",
+    "EncryptedMediaUtils.h",
+    "HTMLMediaElementEncryptedMedia.cpp",
+    "HTMLMediaElementEncryptedMedia.h",
+    "MediaEncryptedEvent.cpp",
+    "MediaEncryptedEvent.h",
+    "MediaKeyMessageEvent.cpp",
+    "MediaKeyMessageEvent.h",
+    "MediaKeySession.cpp",
+    "MediaKeySession.h",
+    "MediaKeyStatusMap.cpp",
+    "MediaKeyStatusMap.h",
+    "MediaKeySystemAccess.cpp",
+    "MediaKeySystemAccess.h",
+    "MediaKeys.cpp",
+    "MediaKeys.h",
+    "MediaKeysClient.h",
+    "MediaKeysController.cpp",
+    "MediaKeysController.h",
+    "NavigatorRequestMediaKeySystemAccess.cpp",
+    "NavigatorRequestMediaKeySystemAccess.h",
+    "SimpleContentDecryptionModuleResultPromise.cpp",
+    "SimpleContentDecryptionModuleResultPromise.h",
+  ]
+}