Added text filtering to Overview Mode

ash/wm/overview/window_grid.h

Index: ash/wm/overview/window_grid.h
diff --git a/ash/wm/overview/window_grid.h b/ash/wm/overview/window_grid.h
index fe4bf780ccc21a98c4ef46edd122fd684f5a437c..1a1a111a79007ca542bbe57bc193b5421ac86cf2 100644
--- a/ash/wm/overview/window_grid.h
+++ b/ash/wm/overview/window_grid.h
@@ -66,6 +66,10 @@ class ASH_EXPORT WindowGrid : public aura::WindowObserver {
   // this grid owns.
   bool Contains(const aura::Window* window) const;
 
+  // Dims the items that do not match the given pattern and prevents their
+  // selection.
+  void Filter(const base::string16& pattern);

[tdanderson, 2014/06/25 15:48:23]

I'd prefer a slightly more descriptive name such as "FilterItems"

[Nina, 2014/06/26 15:20:17]

Done.

+
   // Returns true if the grid has no more windows.
   bool empty() const { return window_list_.empty(); }
 
@@ -124,6 +128,9 @@ class ASH_EXPORT WindowGrid : public aura::WindowObserver {
   // Current selected window position.
   size_t selected_index_;
 
+  // Indicates if there is at least one non filtered item in the overview.

[tdanderson, 2014/06/25 15:48:23]

I notice that you are using four different terms in your comments, method names,
and variable names to all mean essentially the same thing: dimmed, filtered,
active, and visible. I suggest using the same one everywhere for consistency.
"Visible" is a bit misleading since the items are still visible (just
transparent), and "active" is overloaded. So I'd go with either "dimmed" or
"filtered".

[Nina, 2014/06/26 15:20:17]

The echoes of my English teacher - don't repeat the same word, use synonyms!
Actually dimmed and filtered mean one thing, active and visible another thing.
Changed.

+  bool item_active_;

[tdanderson, 2014/06/25 15:48:23]

I would re-name to be more descriptive, e.g., something like has_active_item_.
The name as-is suggests that there is only one "item" and it is either active or
not.

[Nina, 2014/06/26 15:20:17]

Done.

+
   // Number of columns in the grid.
   size_t num_columns_;