Allow Services to be created through Dagger.

This is a significant change that allows Services to have their
constructed injected into.

This change includes DozeService as an example, injecting the
FalsingManager into its constructor.

Bug: 136279712
Test: atest SystemUITests
Change-Id: Ib58f8763c996fbc2aea07ead56493d2d9e936f5b

packages/SystemUI/docs/dagger.md

@@ -53,7 +53,7 @@ variants (like other form factors e.g. Car).
 ### Adding injection to a new SystemUI object
 
 Anything that depends on any `@Singleton` provider from SystemUIRootComponent
-should be declared as an `@Subcomponent` of the root component, this requires
+should be declared as a `@Subcomponent` of the root component. This requires
 declaring your own interface for generating your own modules or just the
 object you need injected. The subcomponent also needs to be added to
 SystemUIRootComponent in SystemUIFactory so it can be acquired.
@@ -204,6 +204,13 @@ public CustomView(@Named(VIEW_CONTEXT) Context themedViewContext, AttributeSet a
 }
 ```
 
+## Updating Dagger2
+
+Binaries can be downloaded from https://repo1.maven.org/maven2/com/google/dagger/ and then loaded
+into
+[/prebuilts/tools/common/m2/repository/com/google/dagger/](http://cs/android/prebuilts/tools/common/m2/repository/com/google/dagger/)
+
+
 ## TODO List
 
  - Eliminate usages of Dependency#get