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

ash/common/test/test_palette_delegate.cc

Index: ash/common/test/test_palette_delegate.cc
diff --git a/ash/common/test/test_palette_delegate.cc b/ash/common/test/test_palette_delegate.cc
index b3bd02943eddb954d7b48ac2e2f9d780073ed725..7350d8ed175c9664bf214a0eb828b7a3aae9d405 100644
--- a/ash/common/test/test_palette_delegate.cc
+++ b/ash/common/test/test_palette_delegate.cc
@@ -45,8 +45,11 @@ void TestPaletteDelegate::TakeScreenshot() {
   ++take_screenshot_count_;
 }
 
-void TestPaletteDelegate::TakePartialScreenshot() {
+void TestPaletteDelegate::TakePartialScreenshot(const base::Closure& done) {
   ++take_partial_screenshot_count_;
+  partial_screenshot_done_ = done;
 }
 
+void TestPaletteDelegate::CancelPartialScreenshot() {}
+
 }  // namespace ash