Update to V8 with partial snapshots. This is taken from the partial_snapshot branch of V8.
diff --git a/src/SConscript b/src/SConscript
index ebda77a..864b4e7 100755
--- a/src/SConscript
+++ b/src/SConscript
@@ -131,6 +131,24 @@
   'armvariant:thumb2': Split("""
     arm/assembler-thumb2.cc
     """),
+  'arch:mips': Split("""
+    mips/assembler-mips.cc
+    mips/builtins-mips.cc
+    mips/codegen-mips.cc
+    mips/constants-mips.cc
+    mips/cpu-mips.cc
+    mips/debug-mips.cc
+    mips/disasm-mips.cc
+    mips/fast-codegen-mips.cc
+    mips/full-codegen-mips.cc
+    mips/frames-mips.cc
+    mips/ic-mips.cc
+    mips/jump-target-mips.cc
+    mips/macro-assembler-mips.cc
+    mips/register-allocator-mips.cc
+    mips/stub-cache-mips.cc
+    mips/virtual-frame-mips.cc
+    """),
   'arch:ia32': Split("""
     ia32/assembler-ia32.cc
     ia32/builtins-ia32.cc
@@ -168,6 +186,7 @@
     x64/virtual-frame-x64.cc
     """),
   'simulator:arm': ['arm/simulator-arm.cc'],
+  'simulator:mips': ['mips/simulator-mips.cc'],
   'os:freebsd': ['platform-freebsd.cc', 'platform-posix.cc'],
   'os:openbsd': ['platform-openbsd.cc', 'platform-posix.cc'],
   'os:linux':   ['platform-linux.cc', 'platform-posix.cc'],
@@ -226,11 +245,11 @@
 math.js
 messages.js
 apinatives.js
-debug-delay.js
-mirror-delay.js
-date-delay.js
-regexp-delay.js
-json-delay.js
+date.js
+regexp.js
+json.js
+mirror-debugger.js
+debug-debugger.js
 '''.split()