Use TARGET_DEFAULT_JAVA_LIBRARIES instead of just framework.

- When raising the ProGuard sdk version for platform build, use
  TARGET_DEFAULT_JAVA_LIBRARIES instead of just framework.
- Also added SUPPORT_LIBRARY_ROOT to reference support library resource
  dir.

Bug: 20658265
Change-Id: Ib008d8e70508723db91431a062cac691367f2f6c
diff --git a/core/config.mk b/core/config.mk
index 3892204..c3ed00f 100644
--- a/core/config.mk
+++ b/core/config.mk
@@ -623,6 +623,13 @@
 HISTORICAL_SDK_VERSIONS_ROOT := $(TOPDIR)prebuilts/sdk
 HISTORICAL_NDK_VERSIONS_ROOT := $(TOPDIR)prebuilts/ndk
 
+# The path where app can reference the support library resources.
+ifdef TARGET_BUILD_APPS
+SUPPORT_LIBRARY_ROOT := $(HISTORICAL_SDK_VERSIONS_ROOT)/current/support
+else
+SUPPORT_LIBRARY_ROOT := frameworks/support
+endif
+
 # Historical SDK version N is stored in $(HISTORICAL_SDK_VERSIONS_ROOT)/N.
 # The 'current' version is whatever this source tree is.
 #