Add power-user keyboard mode for ChromeOS with Search key acting as a typical Fn key.

chrome/browser/ui/ash/event_rewriter.h

Index: chrome/browser/ui/ash/event_rewriter.h
diff --git a/chrome/browser/ui/ash/event_rewriter.h b/chrome/browser/ui/ash/event_rewriter.h
index 1d01ed4a2695a9250a45fb2a6341d7d48b40bdc5..c0e81a9e6f2c6750f65f006cc769acd8a051a8a2 100644
--- a/chrome/browser/ui/ash/event_rewriter.h
+++ b/chrome/browser/ui/ash/event_rewriter.h
@@ -95,7 +95,8 @@ class EventRewriter : public ash::EventRewriterDelegate,
 #endif
 
   // Rewrites the |event| by applying all RewriteXXX functions as needed.
-  void Rewrite(ui::KeyEvent* event);
+  // Returns whether the event should be rewritten or dropped.
+  ash::EventRewriterDelegate::Action Rewrite(ui::KeyEvent* event);
 
   // Rewrites a modifier key press/release following the current user
   // preferences.
@@ -116,8 +117,21 @@ class EventRewriter : public ash::EventRewriterDelegate,
   //  * Alt+Down -> Next (aka PageDown)
   //  * Ctrl+Alt+Up -> Home
   //  * Ctrl+Alt+Down -> End
+  // When the Search key acts as a function key, it instead maps:
+  //  * Search+Backspace -> Delete
+  //  * Search+Up -> Prior (aka PageUp)
+  //  * Search+Down -> Next (aka PageDown)
+  //  * Search+Left -> Home
+  //  * Search+right -> End
+  // Returns true whn the |event| is rewritten.

[Yusuke Sato, 2012/11/26 06:09:38]

nit: when

[danakj, 2012/11/26 19:36:26]

Done.

   bool RewriteBackspaceAndArrowKeys(ui::KeyEvent* event);
 
+#if defined(OS_CHROMEOS)
+  // When the Search key acts as a function key, it drops Search key presses,
+  // and drops the release as well if any key is pressed while Search was down.
+  bool DropSearchKey(ui::KeyEvent* event);
+#endif
+
   // Rewrites the located |event|.
   void RewriteLocatedEvent(ui::LocatedEvent* event);
 
@@ -146,6 +160,10 @@ class EventRewriter : public ash::EventRewriterDelegate,
   int last_device_id_;
 
 #if defined(OS_CHROMEOS)
+  bool drop_search_key_release_;

[Yusuke Sato, 2012/11/26 06:09:38]

nit: you might want to remove line 164-166.

[danakj, 2012/11/26 19:36:26]

Done.

+#endif
+
+#if defined(OS_CHROMEOS)
   // X keycodes corresponding to various keysyms.
   unsigned int control_l_xkeycode_;
   unsigned int control_r_xkeycode_;
@@ -172,6 +190,18 @@ class EventRewriter : public ash::EventRewriterDelegate,
   unsigned int kp_8_xkeycode_;
   unsigned int kp_9_xkeycode_;
   unsigned int kp_decimal_xkeycode_;
+  unsigned int f1_xkeycode_;

[Yusuke Sato, 2012/11/26 06:09:38]

Looks like this part is for the next CL.

[danakj, 2012/11/26 19:36:26]

Done.

+  unsigned int f2_xkeycode_;
+  unsigned int f3_xkeycode_;
+  unsigned int f4_xkeycode_;
+  unsigned int f5_xkeycode_;
+  unsigned int f6_xkeycode_;
+  unsigned int f7_xkeycode_;
+  unsigned int f8_xkeycode_;
+  unsigned int f9_xkeycode_;
+  unsigned int f10_xkeycode_;
+  unsigned int f11_xkeycode_;
+  unsigned int f12_xkeycode_;
 
   chromeos::input_method::XKeyboard* xkeyboard_;  // for testing.
 #endif