Replace GrStringBuilder with SkString. First step in cleaning up the shader generator. Slight performance hit when creating a new shader (<10% of total shader gen time on my Windows box is spent in building our string before handing it to GL). Much of this can be recovered by better usage pattern of SkString in coming revisions.

Review URL: http://codereview.appspot.com/4465053/ 



git-svn-id: http://skia.googlecode.com/svn/trunk@1266 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/xcode/gpu/gpu.xcodeproj/project.pbxproj b/xcode/gpu/gpu.xcodeproj/project.pbxproj
index 438ac39..ab37ab8 100644
--- a/xcode/gpu/gpu.xcodeproj/project.pbxproj
+++ b/xcode/gpu/gpu.xcodeproj/project.pbxproj
@@ -570,6 +570,10 @@
 				);
 				GCC_WARN_ABOUT_RETURN_TYPE = YES;
 				GCC_WARN_UNUSED_VARIABLE = YES;
+				HEADER_SEARCH_PATHS = (
+					../../include/core,
+					../../include/config,
+				);
 				ONLY_ACTIVE_ARCH = YES;
 				PREBINDING = NO;
 				SDKROOT = macosx10.6;