Media player: Add shortcut keys (Ctrl+Shift+I/J/C/B) to media players for debug.

ui/file_manager/video_player/js/video_player.js

Index: ui/file_manager/video_player/js/video_player.js
diff --git a/ui/file_manager/video_player/js/video_player.js b/ui/file_manager/video_player/js/video_player.js
index e414340bb80974fe0eb5669256663b498d42776a..ab83c4abc92c7485b22861c20bd39e4d70e51183 100644
--- a/ui/file_manager/video_player/js/video_player.js
+++ b/ui/file_manager/video_player/js/video_player.js
@@ -27,7 +27,21 @@ function FullWindowVideoControls(
   this.updateStyle();
   window.addEventListener('resize', this.updateStyle.wrap(this));
   document.addEventListener('keydown', function(e) {
-    switch (e.keyIdentifier) {
+    switch (util.getKeyModifiers(e) + e.keyIdentifier) {
+      // Handle debug shortcut keys.
+      case 'Ctrl-Shift-U+0049': // Ctrl+Shift+I
+        chrome.fileManagerPrivate.openInspector('normal');
+        break;
+      case 'Ctrl-Shift-U+004A': // Ctrl+Shift+J
+        chrome.fileManagerPrivate.openInspector('console');
+        break;
+      case 'Ctrl-Shift-U+0043': // Ctrl+Shift+C
+        chrome.fileManagerPrivate.openInspector('element');
+        break;
+      case 'Ctrl-Shift-U+0042': // Ctrl+Shift+B
+        chrome.fileManagerPrivate.openInspector('background');
+        break;
+
       case 'U+0020': // Space
       case 'MediaPlayPause':
         this.togglePlayStateWithFeedback();