Add ChromeVox panel and implement caption display functionality.

chrome/browser/resources/chromeos/chromevox/chromevox_assets.gypi

Index: chrome/browser/resources/chromeos/chromevox/chromevox_assets.gypi
diff --git a/chrome/browser/resources/chromeos/chromevox/chromevox_assets.gypi b/chrome/browser/resources/chromeos/chromevox/chromevox_assets.gypi
index 61c8479639b7a94fc8a64c2fc82350b97ad4617c..f7a523463dc651d3252218c96dd7195344bdae8d 100644
--- a/chrome/browser/resources/chromeos/chromevox/chromevox_assets.gypi
+++ b/chrome/browser/resources/chromeos/chromevox/chromevox_assets.gypi
@@ -4,11 +4,16 @@
 
 {
   'variables': {
-    'chromevox_assets_chromevox': [
-      'chromevox/chromevox-128.png',
-      'chromevox/chromevox-16.png',
-      'chromevox/chromevox-19.png',
-      'chromevox/chromevox-48.png',
+    'chromevox_assets_images': [

[Peter Lundblad, 2015/11/10 10:46:36]

chromevox_assets_chromevox is still referred in BUILD.gn and needs to be
updated.

[dmazzoni, 2015/11/10 17:33:17]

Good catch, thanks.

+      'images/chromevox-128.png',
+      'images/chromevox-16.png',
+      'images/chromevox-19.png',
+      'images/chromevox-48.png',
+      'images/close-19.png',
+      'images/close-hover-19.png',
+      'images/options-19.png',
+      'images/options-hover-19.png',
+      'images/triangle-6.png',
     ],
     'chromevox_assets_chromevox_background_earcons': [
       'chromevox/background/earcons/alert_modal.ogg',
@@ -92,9 +97,9 @@
       'type': 'none',
       'copies': [
         {
-          'destination': '<(chromevox_dest_dir)/chromevox',
+          'destination': '<(chromevox_dest_dir)/images',
           'files': [
-            '<@(chromevox_assets_chromevox)',
+            '<@(chromevox_assets_images)',
           ],
         },
         {