Use fake Input Device Settings with chrome://device-emulator

chrome/chrome_browser_chromeos.gypi

Index: chrome/chrome_browser_chromeos.gypi
diff --git a/chrome/chrome_browser_chromeos.gypi b/chrome/chrome_browser_chromeos.gypi
index f2e2360fb5b8dd116e7c9aecb0e167ccf7feb55f..689e52f040f8af84ec413f5fcb3854e6b6c472ae 100644
--- a/chrome/chrome_browser_chromeos.gypi
+++ b/chrome/chrome_browser_chromeos.gypi
@@ -1132,6 +1132,12 @@
         'browser/chromeos/extensions/wallpaper_private_api.h',
         'browser/ui/webui/voice_search_ui.cc',
         'browser/ui/webui/voice_search_ui.h',
+
+    ],
+    # Sources that should not be included in the official build.
+    'browser_chromeos_non_official_sources': [
+        'browser/chromeos/system/fake_input_device_settings.cc',
+        'browser/chromeos/system/fake_input_device_settings.h',
     ],
   },
   'targets': [
@@ -1329,6 +1335,15 @@
           ],
         }],
       ],
+      'configurations': {
+        'Debug': {
+          'conditions': [
+            ['buildtype!="Official"', {

[stevenjb, 2016/05/24 20:57:25]

Do we even support official Debug builds?

+              'sources': [ '<@(browser_chromeos_non_official_sources)' ],
+            }],
+          ],
+        },
+      },
     },
     {
       # GN version: //chrome/browser/chromeos:device_policy_proto