Make Keyguard a library and make StatusBar the new Keyguard.

This change achieves a couple of things:
- Let Keyguard be a library, so we can use it in SystemUI.
- Introduce FLAG_KEYGUARD for windows and deprecate TYPE_KEYGUARD. Make
all the TYPE_KEYGUARD behaviour dependant on the flag.
- Implement a new KeyguardService in SystemUI, and bind that service
from PhoneWindowManager.
- Introduce BaseStatusBar.setKeyguardState and inflate
KeyguardSimpleHostView there and use FLAG_KEYGUARD for the window, such
that the status bar window essentially gets the Keyguard.

Bug: 13635952
Change-Id: I059d80d8b9b9818a778ab685f4672ea2694def63
diff --git a/packages/SystemUI/Android.mk b/packages/SystemUI/Android.mk
index f8f064a..69c6159 100644
--- a/packages/SystemUI/Android.mk
+++ b/packages/SystemUI/Android.mk
@@ -6,6 +6,7 @@
 LOCAL_SRC_FILES := $(call all-java-files-under, src) \
     src/com/android/systemui/EventLogTags.logtags
 
+LOCAL_STATIC_JAVA_LIBRARIES := Keyguard
 LOCAL_JAVA_LIBRARIES := telephony-common
 
 LOCAL_PACKAGE_NAME := SystemUI
@@ -14,6 +15,11 @@
 
 LOCAL_PROGUARD_FLAG_FILES := proguard.flags
 
+LOCAL_RESOURCE_DIR := \
+    frameworks/base/packages/Keyguard/res \
+    $(LOCAL_PATH)/res
+LOCAL_AAPT_FLAGS := --auto-add-overlay --extra-packages com.android.keyguard
+
 include $(BUILD_PACKAGE)
 
 include $(call all-makefiles-under,$(LOCAL_PATH))