Add test skeletons for arm and mips.

runtime/vm/vm_sources.gypi

Index: runtime/vm/vm_sources.gypi
===================================================================
--- runtime/vm/vm_sources.gypi	(revision 17327)
+++ runtime/vm/vm_sources.gypi	(working copy)
@@ -14,6 +14,7 @@
     'assembler_test.cc',
     'assembler_arm.cc',
     'assembler_arm.h',
+    'assembler_arm_test.cc',
     'assembler_ia32.cc',
     'assembler_ia32.h',
     'assembler_ia32_test.cc',
@@ -28,6 +29,7 @@
     'assembler_macros_x64.h',
     'assembler_mips.cc',
     'assembler_mips.h',
+    'assembler_mips_test.cc',
     'assembler_x64.cc',
     'assembler_x64.h',
     'assembler_x64_test.cc',
@@ -76,9 +78,11 @@
     'code_patcher.h',
     'code_patcher.cc',
     'code_patcher_arm.cc',
+    'code_patcher_arm_test.cc',
     'code_patcher_ia32.cc',
     'code_patcher_ia32_test.cc',
     'code_patcher_mips.cc',
+    'code_patcher_mips_test.cc',
     'code_patcher_x64.cc',
     'code_patcher_x64_test.cc',
     'compiler.h',
@@ -186,11 +190,13 @@
     'instructions.h',
     'instructions_arm.cc',
     'instructions_arm.h',
+    'instructions_arm_test.cc',
     'instructions_ia32.cc',
     'instructions_ia32.h',
     'instructions_ia32_test.cc',
     'instructions_mips.cc',
     'instructions_mips.h',
+    'instructions_mips_test.cc',
     'instructions_x64.cc',
     'instructions_x64.h',
     'instructions_x64_test.cc',
@@ -296,9 +302,11 @@
     'stub_code.cc',
     'stub_code.h',
     'stub_code_arm.cc',
+    'stub_code_arm_test.cc',
     'stub_code_ia32.cc',
     'stub_code_ia32_test.cc',
     'stub_code_mips.cc',
+    'stub_code_mips_test.cc',
     'stub_code_x64.cc',
     'stub_code_x64_test.cc',
     'symbols.cc',