Third wave of Win64 warning cleanup

https://codereview.chromium.org/27487003/



git-svn-id: http://skia.googlecode.com/svn/trunk@11817 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/gpu/gl/GrGLShaderBuilder.cpp b/src/gpu/gl/GrGLShaderBuilder.cpp
index 8b7d614..7194240 100644
--- a/src/gpu/gl/GrGLShaderBuilder.cpp
+++ b/src/gpu/gl/GrGLShaderBuilder.cpp
@@ -630,7 +630,7 @@
     }
 
     const GrGLchar* sourceStr = shaderSrc.c_str();
-    int sourceLength = shaderSrc.size();
+    GrGLint sourceLength = static_cast<GrGLint>(shaderSrc.size());
     GR_GL_CALL(gli, ShaderSource(shaderId, 1, &sourceStr, &sourceLength));
 
     GrGLint compiled = GR_GL_INIT_ZERO;