Enable debugger support to make the console.* APIs work with V8.

Note this needs an external/webkit change too.
diff --git a/Android.v8common.mk b/Android.v8common.mk
index 28891db..42ca22f 100644
--- a/Android.v8common.mk
+++ b/Android.v8common.mk
@@ -18,6 +18,8 @@
 	src/counters.cc \
 	src/data-flow.cc \
 	src/dateparser.cc \
+	src/debug.cc \
+	src/debug-agent.cc \
 	src/disassembler.cc \
 	src/execution.cc \
 	src/factory.cc \
@@ -77,6 +79,7 @@
 		src/arm/codegen-arm.cc \
 		src/arm/constants-arm.cc \
 		src/arm/cpu-arm.cc \
+		src/arm/debug-arm.cc \
 		src/arm/disasm-arm.cc \
 		src/arm/frames-arm.cc \
 		src/arm/fast-codegen-arm.cc \
@@ -130,4 +133,6 @@
 	src/date-delay.js \
 	src/regexp-delay.js \
 	src/json-delay.js \
+	src/mirror-delay.js \
+	src/debug-delay.js \
 	src/macros.py