Move more sources from modules.gypi to subdirectories.

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

Index: third_party/WebKit/Source/modules/device_orientation/BUILD.gn
diff --git a/third_party/WebKit/Source/modules/device_orientation/BUILD.gn b/third_party/WebKit/Source/modules/device_orientation/BUILD.gn
new file mode 100644
index 0000000000000000000000000000000000000000..9a3c589d4c3d51efb0c4d2cde7b478dd2069264d
--- /dev/null
+++ b/third_party/WebKit/Source/modules/device_orientation/BUILD.gn
@@ -0,0 +1,34 @@
+# 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("device_orientation") {
+  sources = [
+    "DeviceAcceleration.cpp",
+    "DeviceAcceleration.h",
+    "DeviceMotionController.cpp",
+    "DeviceMotionController.h",
+    "DeviceMotionData.cpp",
+    "DeviceMotionData.h",
+    "DeviceMotionDispatcher.cpp",
+    "DeviceMotionDispatcher.h",
+    "DeviceMotionEvent.cpp",
+    "DeviceMotionEvent.h",
+    "DeviceOrientationAbsoluteController.cpp",
+    "DeviceOrientationAbsoluteController.h",
+    "DeviceOrientationController.cpp",
+    "DeviceOrientationController.h",
+    "DeviceOrientationData.cpp",
+    "DeviceOrientationData.h",
+    "DeviceOrientationDispatcher.cpp",
+    "DeviceOrientationDispatcher.h",
+    "DeviceOrientationEvent.cpp",
+    "DeviceOrientationEvent.h",
+    "DeviceOrientationInspectorAgent.cpp",
+    "DeviceOrientationInspectorAgent.h",
+    "DeviceRotationRate.cpp",
+    "DeviceRotationRate.h",
+  ]
+}