Created uber tray UI for monitoring ongoing WebDrive sync operations

ash/system/tray/system_tray.cc

Index: ash/system/tray/system_tray.cc
diff --git a/ash/system/tray/system_tray.cc b/ash/system/tray/system_tray.cc
index 364fc555206560601521b3c1a6f9cb047427c496..070df408d3b4b0369156f45ce98dfe331b36090b 100644
--- a/ash/system/tray/system_tray.cc
+++ b/ash/system/tray/system_tray.cc
@@ -11,6 +11,7 @@
 #include "ash/system/bluetooth/tray_bluetooth.h"
 #include "ash/system/brightness/tray_brightness.h"
 #include "ash/system/date/tray_date.h"
+#include "ash/system/drive/tray_drive.h"
 #include "ash/system/ime/tray_ime.h"
 #include "ash/system/network/tray_network.h"
 #include "ash/system/power/power_status_observer.h"
@@ -458,6 +459,13 @@ BluetoothDeviceInfo::BluetoothDeviceInfo()
 BluetoothDeviceInfo::~BluetoothDeviceInfo() {
 }
 
+DriveOperationStatus::DriveOperationStatus()
+    : progress(0.0), type(OPERATION_OTHER), state(OPERATION_NOT_STARTED) {

[xiyuan, 2012/05/01 16:47:53]

nit: each member on its own line

+}
+
+DriveOperationStatus::~DriveOperationStatus() {
+}
+
 IMEInfo::IMEInfo()
     : selected(false) {
 }
@@ -480,6 +488,7 @@ SystemTray::SystemTray()
       brightness_observer_(NULL),
       caps_lock_observer_(NULL),
       clock_observer_(NULL),
+      drive_observer_(NULL),
       ime_observer_(NULL),
       network_observer_(NULL),
       power_status_observer_(NULL),
@@ -533,6 +542,7 @@ void SystemTray::CreateItems() {
   internal::TrayAccessibility* tray_accessibility =
       new internal::TrayAccessibility;
   internal::TrayCapsLock* tray_caps_lock = new internal::TrayCapsLock;
+  internal::TrayDrive* tray_drive = new internal::TrayDrive;
   internal::TrayIME* tray_ime = new internal::TrayIME;
   internal::TrayUpdate* tray_update = new internal::TrayUpdate;
 
@@ -542,6 +552,7 @@ void SystemTray::CreateItems() {
   brightness_observer_ = tray_brightness;
   caps_lock_observer_ = tray_caps_lock;
   clock_observer_ = tray_date;
+  drive_observer_ = tray_drive;
   ime_observer_ = tray_ime;
   network_observer_ = tray_network;
   power_status_observer_ = tray_power;
@@ -553,6 +564,7 @@ void SystemTray::CreateItems() {
   AddTrayItem(tray_power);
   AddTrayItem(tray_network);
   AddTrayItem(tray_bluetooth);
+  AddTrayItem(tray_drive);
   AddTrayItem(tray_ime);
   AddTrayItem(tray_volume);
   AddTrayItem(tray_brightness);