Expand the dexpreopt image dependencies to entire image

Instead of just depending on the main .art file (boot.art, etc), also
expose the dependencies to the .oat/.vdex files (boot.oat/boot.vdex),
and all of the module files that get implicitly loading (boot-ext.*,
boot-framework.*, etc)

This is necessary for RBE, where the rule only gets the files that it
depends upon.

Test: treehugger
Test: build a system image with RBE
Change-Id: I0c7051f18582f1891d3398b46763b1521e4326c8
diff --git a/dexpreopt/config.go b/dexpreopt/config.go
index 5a1bd74..a2f1af4 100644
--- a/dexpreopt/config.go
+++ b/dexpreopt/config.go
@@ -121,8 +121,9 @@
 	UsesLibraries                []string
 	LibraryPaths                 map[string]android.Path
 
-	Archs           []android.ArchType
-	DexPreoptImages []android.Path
+	Archs               []android.ArchType
+	DexPreoptImages     []android.Path
+	DexPreoptImagesDeps []android.Paths
 
 	PreoptBootClassPathDexFiles     android.Paths // file paths of boot class path files
 	PreoptBootClassPathDexLocations []string      // virtual locations of boot class path files
@@ -257,6 +258,9 @@
 	config.ModuleConfig.StripInputPath = constructPath(ctx, config.StripInputPath)
 	config.ModuleConfig.StripOutputPath = constructWritablePath(ctx, config.StripOutputPath)
 
+	// This needs to exist, but dependencies are already handled in Make, so we don't need to pass them through JSON.
+	config.ModuleConfig.DexPreoptImagesDeps = make([]android.Paths, len(config.ModuleConfig.DexPreoptImages))
+
 	return config.ModuleConfig, nil
 }