Allow the user to cancel the capture region action, and show its active status in the tray.

ash/common/system/chromeos/palette/palette_tool.cc

Index: ash/common/system/chromeos/palette/palette_tool.cc
diff --git a/ash/common/system/chromeos/palette/palette_tool.cc b/ash/common/system/chromeos/palette/palette_tool.cc
index 9f50f8c5a516f0dde0607168ad629c454ae74c53..31382d92bb62e23eed7e6922ce2d3f1643fab7a8 100644
--- a/ash/common/system/chromeos/palette/palette_tool.cc
+++ b/ash/common/system/chromeos/palette/palette_tool.cc
@@ -6,7 +6,7 @@
 
 #include "ash/common/system/chromeos/palette/palette_tool_manager.h"
 #include "ash/common/system/chromeos/palette/palette_utils.h"
-#include "ash/common/system/chromeos/palette/tools/capture_region_action.h"
+#include "ash/common/system/chromeos/palette/tools/capture_region_mode.h"
 #include "ash/common/system/chromeos/palette/tools/capture_screen_action.h"
 #include "ash/common/system/chromeos/palette/tools/create_note_action.h"
 #include "ash/common/system/chromeos/palette/tools/magnifier_mode.h"
@@ -17,7 +17,7 @@ namespace ash {
 
 // static
 void PaletteTool::RegisterToolInstances(PaletteToolManager* tool_manager) {
-  tool_manager->AddTool(base::MakeUnique<CaptureRegionAction>(tool_manager));
+  tool_manager->AddTool(base::MakeUnique<CaptureRegionMode>(tool_manager));
   tool_manager->AddTool(base::MakeUnique<CaptureScreenAction>(tool_manager));
   tool_manager->AddTool(base::MakeUnique<CreateNoteAction>(tool_manager));
   if (ArePaletteExperimentalFeaturesEnabled())