Add back call stats feature.

Change-Id: Id10bc12cacaee3523b7614bce8493d8b423b3f40

Conflicts:
	src/com/android/dialer/CallDetailActivity.java
	src/com/android/dialer/calllog/CallLogAdapter.java
Enable contact photo preloading.

Avoids the delay occuring otherwise when checking into call details.

Change-Id: Ie48285bb03fde0434429079f141ec57dc75a65b9