Implement the rest of the PPAPI examples in the GN build.

ppapi/examples/BUILD.gn

 # Copyright 2015 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.
 
 group("examples") {
   testonly = true
   deps = [
+    "//ppapi/examples/2d",
     "//ppapi/examples/audio",
+    "//ppapi/examples/audio_input",
+    "//ppapi/examples/compositor",
+    "//ppapi/examples/crxfs",
+    "//ppapi/examples/enumerate_devices",
+    "//ppapi/examples/file_chooser",
+    "//ppapi/examples/flash_topmost",
+    "//ppapi/examples/font",
+    "//ppapi/examples/gamepad",
+    "//ppapi/examples/gles2",
+    "//ppapi/examples/gles2_spinning_cube",
+    "//ppapi/examples/ime",
+    "//ppapi/examples/input",
+    "//ppapi/examples/media_stream_audio",
+    "//ppapi/examples/media_stream_video",
+    "//ppapi/examples/mouse_cursor",
+    "//ppapi/examples/mouse_lock",
+    "//ppapi/examples/printing",
+    "//ppapi/examples/scaling",
+    "//ppapi/examples/scripting",
+    "//ppapi/examples/stub",
+    "//ppapi/examples/threading",
+    "//ppapi/examples/url_loader",
+    "//ppapi/examples/video_capture",
+    "//ppapi/examples/video_decode",
+    "//ppapi/examples/video_effects",
   ]
 }