Added presubmit.py to the tools tab for easier access.

tools/v8.xcodeproj/project.pbxproj

Index: tools/v8.xcodeproj/project.pbxproj
===================================================================
--- tools/v8.xcodeproj/project.pbxproj	(revision 318)
+++ tools/v8.xcodeproj/project.pbxproj	(working copy)
@@ -456,6 +456,7 @@
 		897FF1B50E719C0900D62E90 /* shell.cc */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = shell.cc; sourceTree = "<group>"; };
 		897FF1B60E719C2300D62E90 /* js2c.py */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text.script.python; path = js2c.py; sourceTree = "<group>"; };
 		897FF1B70E719C2E00D62E90 /* macros.py */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text.script.python; name = macros.py; path = ../src/macros.py; sourceTree = "<group>"; };
+		89B12E8D0E7FF2A40080BA62 /* presubmit.py */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text.script.python; path = presubmit.py; sourceTree = "<group>"; };
 		897FF1BF0E719CB600D62E90 /* libjscre.a */ = {isa = PBXFileReference; explicitFileType = archive.ar; includeInIndex = 0; path = libjscre.a; sourceTree = BUILT_PRODUCTS_DIR; };
 		89F23C870E78D5B2006B2466 /* libv8-arm.a */ = {isa = PBXFileReference; explicitFileType = archive.ar; includeInIndex = 0; path = "libv8-arm.a"; sourceTree = BUILT_PRODUCTS_DIR; };
 		89F23C950E78D5B6006B2466 /* v8_shell-arm */ = {isa = PBXFileReference; explicitFileType = "compiled.mach-o.executable"; includeInIndex = 0; path = "v8_shell-arm"; sourceTree = BUILT_PRODUCTS_DIR; };
@@ -798,6 +799,7 @@
 			children = (
 				897FF1B60E719C2300D62E90 /* js2c.py */,
 				897FF1B70E719C2E00D62E90 /* macros.py */,
+				89B12E8D0E7FF2A40080BA62 /* presubmit.py */,
 			);
 			path = tools;
 			sourceTree = "<group>";