Aura: Rework window mode flags to compact/overlapping/managed

* Rename "normal" to "overlapping", since there was some confusion about whether or not compact mode is "normal"
* Remove "--aura-workspace-manager" flag in favor of "--aura-window-mode=managed", as this feature is not compatible with compact mode.
* Change about:flags Window mode to a three-way choice between modes

BUG=112139
TEST=aura_shell_unittests ShellTest, manual check of about:flags


Review URL: http://codereview.chromium.org/9316005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@120035 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/ash/shell.h b/ash/shell.h
index ab4da7b..16add64a 100644
--- a/ash/shell.h
+++ b/ash/shell.h
@@ -65,11 +65,12 @@
 class ASH_EXPORT Shell {
  public:
   // In compact window mode we fill the screen with a single maximized window,
-  // similar to ChromeOS R17 and earlier.  In normal mode we have draggable
-  // windows.
+  // similar to ChromeOS R17 and earlier.  In overlapping mode we have draggable
+  // windows.  In managed mode the workspace arranges windows for the user.
   enum WindowMode {
-    NORMAL_MODE,
-    COMPACT_MODE
+    MODE_COMPACT,
+    MODE_MANAGED,
+    MODE_OVERLAPPING,
   };
 
   // A shell must be explicitly created so that it can call |Init()| with the
@@ -107,7 +108,7 @@
   bool IsModalWindowOpen() const;
 
   // See enum WindowMode for details.
-  bool IsWindowModeCompact() const { return window_mode_ == COMPACT_MODE; }
+  bool IsWindowModeCompact() const { return window_mode_ == MODE_COMPACT; }
 
   // Creates a default views::NonClientFrameView for use by windows in the
   // Ash environment.
@@ -158,7 +159,7 @@
   // Initializes or re-initializes the layout managers and event filters needed
   // to support a given window mode and cleans up the unneeded ones.
   void SetupCompactWindowMode();
-  void SetupNormalWindowMode();
+  void SetupNonCompactWindowMode();
 
   // Sets the LayoutManager of the container with the specified id to NULL. This
   // has the effect of deleting the current LayoutManager.