Add presubmit=no and werror=no flags to Makefile

Makefile

 # Copyright 2011 the V8 project authors. All rights reserved.
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 #       notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 #       copyright notice, this list of conditions and the following
 #       disclaimer in the documentation and/or other materials provided
@@ skipping 14 matching lines @@
 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 
 # Variable default definitions. Override them by exporting them in your shell.
 CXX ?= "g++"  # For distcc: export CXX="distcc g++"
 LINK ?= "g++"
 OUTDIR ?= out
 TESTJOBS ?= -j16
 GYPFLAGS ?=
+TESTFLAGS ?=
 
 # Special build flags. Use them like this: "make library=shared"
 
 # library=shared || component=shared_library
 ifeq ($(library), shared)
   GYPFLAGS += -Dcomponent=shared_library
 endif
 ifdef component
   GYPFLAGS += -Dcomponent=$(component)
 endif
@@ skipping 24 matching lines @@
 # vfp3=off
 ifeq ($(vfp3), off)
   GYPFLAGS += -Dv8_can_use_vfp_instructions=false
 else
   GYPFLAGS += -Dv8_can_use_vfp_instructions=true
 endif
 # soname_version=1.2.3
 ifdef soname_version
   GYPFLAGS += -Dsoname_version=$(soname_version)
 endif
+# werror=no
+ifeq ($(werror), no)
+  GYPFLAGS += -Dwerror=''
+endif
+# presubmit=no
+ifeq ($(presubmit), no)
+  TESTFLAGS += --no-presubmit
+endif
 
 # ----------------- available targets: --------------------
 # - "dependencies": pulls in external dependencies (currently: GYP)
 # - any arch listed in ARCHES (see below)
 # - any mode listed in MODES
 # - every combination <arch>.<mode>, e.g. "ia32.release"
 # - "native": current host's architecture, release mode
 # - any of the above with .check appended, e.g. "ia32.release.check"
 # - default (no target specified): build all ARCHES and MODES
 # - "check": build all targets and run all tests
@@ skipping 40 matching lines @@
                              python -c "print raw_input().capitalize()") \
                  builddir="$(shell pwd)/$(OUTDIR)/$@"
 
 native: $(OUTDIR)/Makefile-native
         @$(MAKE) -C "$(OUTDIR)" -f Makefile-native \
                  CXX="$(CXX)" LINK="$(LINK)" BUILDTYPE=Release \
                  builddir="$(shell pwd)/$(OUTDIR)/$@"
 
 # Test targets.
 check: all
-        @tools/test-wrapper-gypbuild.py $(TESTJOBS) --outdir=$(OUTDIR)
+        @tools/test-wrapper-gypbuild.py $(TESTJOBS) --outdir=$(OUTDIR) \
+            $(TESTFLAGS)
 
 $(addsuffix .check,$(MODES)): $$(basename $$@)
         @tools/test-wrapper-gypbuild.py $(TESTJOBS) --outdir=$(OUTDIR) \
-            --mode=$(basename $@)
+            --mode=$(basename $@) $(TESTFLAGS)
 
 $(addsuffix .check,$(ARCHES)): $$(basename $$@)
         @tools/test-wrapper-gypbuild.py $(TESTJOBS) --outdir=$(OUTDIR) \
-            --arch=$(basename $@)
+            --arch=$(basename $@) $(TESTFLAGS)
 
 $(CHECKS): $$(basename $$@)
         @tools/test-wrapper-gypbuild.py $(TESTJOBS) --outdir=$(OUTDIR) \
-            --arch-and-mode=$(basename $@)
+            --arch-and-mode=$(basename $@) $(TESTFLAGS)
 
 native.check: native
         @tools/test-wrapper-gypbuild.py $(TESTJOBS) --outdir=$(OUTDIR)/native \
-            --arch-and-mode=.
+            --arch-and-mode=. $(TESTFLAGS)
 
 # Clean targets. You can clean each architecture individually, or everything.
 $(addsuffix .clean,$(ARCHES)):
         rm -f $(OUTDIR)/Makefile-$(basename $@)
         rm -rf $(OUTDIR)/$(basename $@).release
         rm -rf $(OUTDIR)/$(basename $@).debug
         find $(OUTDIR) -regex '.*\(host\|target\)-$(basename $@)\.mk' -delete
 
 native.clean:
         rm -f $(OUTDIR)/Makefile-native
@@ skipping 30 matching lines @@
             else mv $(ENVFILE).new $(ENVFILE); fi
 
 # Stores current GYPFLAGS in a file.
 $(ENVFILE).new:
         @mkdir -p $(OUTDIR); echo "GYPFLAGS=$(GYPFLAGS)" > $(ENVFILE).new;
 
 # Dependencies.
 dependencies:
         svn checkout --force http://gyp.googlecode.com/svn/trunk build/gyp \
             --revision 1026