Initial GYP file for skia / gr. Builds SampleApp on Mac, Windows, Linux.

Review URL: http://codereview.appspot.com/4282056/

git-svn-id: http://skia.googlecode.com/svn/trunk@955 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/svg/SkSVGPaintState.cpp b/src/svg/SkSVGPaintState.cpp
index 7fc90c7..f3c65e7 100644
--- a/src/svg/SkSVGPaintState.cpp
+++ b/src/svg/SkSVGPaintState.cpp
@@ -321,7 +321,7 @@
                 if (strncmp(attrValue, "url(", 4) == 0) {
                     SkASSERT(attrValue[4] == '#');
                     const char* idStart = attrValue + 5;
-                    char* idEnd = strrchr(attrValue, ')');
+                    const char* idEnd = strrchr(attrValue, ')');
                     SkASSERT(idStart < idEnd);
                     SkString id(idStart, idEnd - idStart);
                     SkSVGElement* found;