Add "Search" key press/hold UMA metrics.

ash/common/accelerators/accelerator_router.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ash/common/accelerators/accelerator_router.h"
 
 #include "ash/common/accelerators/accelerator_controller.h"
 #include "ash/common/wm/window_state.h"
 #include "ash/common/wm_shell.h"
 #include "ash/common/wm_window.h"
+#include "base/metrics/histogram_macros.h"
 #include "base/stl_util.h"
 #include "ui/base/accelerators/accelerator.h"
 #include "ui/events/event.h"
 
 namespace ash {
 
 namespace {
 
 // Returns true if |key_code| is a key usually handled directly by the shell.
 bool IsSystemKey(ui::KeyboardCode key_code) {
@@ skipping 18 matching lines @@
 
 AcceleratorRouter::AcceleratorRouter() {}
 
 AcceleratorRouter::~AcceleratorRouter() {}
 
 bool AcceleratorRouter::ProcessAccelerator(WmWindow* target,
                                            const ui::KeyEvent& key_event,
                                            const ui::Accelerator& accelerator) {
   // Callers should never supply null.
   DCHECK(target);
+  RecordSearchKeyStats(accelerator);
   // Special hardware keys like brightness and volume are handled in
   // special way. However, some windows can override this behavior
   // (e.g. Chrome v1 apps by default and Chrome v2 apps with
   // permission) by setting a window property.
   if (IsSystemKey(key_event.key_code()) &&
       !CanConsumeSystemKeys(target, key_event)) {
     // System keys are always consumed regardless of whether they trigger an
     // accelerator to prevent windows from seeing unexpected key up events.
     WmShell::Get()->accelerator_controller()->Process(accelerator);
     return true;
   }
   if (!ShouldProcessAcceleratorNow(target, key_event, accelerator))
     return false;
   return WmShell::Get()->accelerator_controller()->Process(accelerator);
 }
 
+void AcceleratorRouter::RecordSearchKeyStats(
+    const ui::Accelerator& accelerator) {
+  if (accelerator.IsCmdDown()) {
+    if (search_key_state_ == RELEASED) {
+      search_key_state_ = PRESSED;
+      search_key_pressed_timestamp_ = base::TimeTicks::Now();
+    }
+
+    if (accelerator.key_code() != ui::KeyboardCode::VKEY_COMMAND &&
+        search_key_state_ == PRESSED) {
+      search_key_state_ = RECORDED;
+      UMA_HISTOGRAM_TIMES(
+          "Keyboard.Shortcuts.CrosSearchKeyDelay",
+          base::TimeTicks::Now() - search_key_pressed_timestamp_);
+    }
+  } else {
+    search_key_state_ = RELEASED;
+  }
+}
+
 bool AcceleratorRouter::CanConsumeSystemKeys(WmWindow* target,
                                              const ui::KeyEvent& event) {
   // Uses the top level window so if the target is a web contents window the
   // containing parent window will be checked for the property.
   WmWindow* top_level = target->GetToplevelWindowForFocus();
   return top_level && top_level->GetWindowState()->can_consume_system_keys();
 }
 
 bool AcceleratorRouter::ShouldProcessAcceleratorNow(
     WmWindow* target,
@@ skipping 28 matching lines @@
 
   // Handle preferred accelerators (such as ALT-TAB) before sending
   // to the target.
   if (accelerator_controller->IsPreferred(accelerator))
     return true;
 
   return WmShell::Get()->GetAppListTargetVisibility();
 }
 
 }  // namespace ash