Third wave of Win64 warning cleanup

src/gpu/gl/GrGpuGL.cpp

Index: src/gpu/gl/GrGpuGL.cpp
===================================================================
--- src/gpu/gl/GrGpuGL.cpp	(revision 11815)
+++ src/gpu/gl/GrGpuGL.cpp	(working copy)
@@ -1167,7 +1167,7 @@
             // make sure driver can allocate memory for this buffer
             GL_ALLOC_CALL(this->glInterface(),
                           BufferData(GR_GL_ARRAY_BUFFER,
-                                     desc.fSizeInBytes,
+                                     (GrGLsizeiptr) desc.fSizeInBytes,
                                      NULL,   // data ptr
                                      desc.fDynamic ? GR_GL_DYNAMIC_DRAW : GR_GL_STATIC_DRAW));
             if (CHECK_ALLOC_ERROR(this->glInterface()) != GR_GL_NO_ERROR) {
@@ -1200,7 +1200,7 @@
             // make sure driver can allocate memory for this buffer
             GL_ALLOC_CALL(this->glInterface(),
                           BufferData(GR_GL_ELEMENT_ARRAY_BUFFER,
-                                     desc.fSizeInBytes,
+                                     (GrGLsizeiptr) desc.fSizeInBytes,
                                      NULL,  // data ptr
                                      desc.fDynamic ? GR_GL_DYNAMIC_DRAW : GR_GL_STATIC_DRAW));
             if (CHECK_ALLOC_ERROR(this->glInterface()) != GR_GL_NO_ERROR) {
@@ -1448,7 +1448,8 @@
     if (rowBytes != tightRowBytes) {
         if (this->glCaps().packRowLengthSupport()) {
             SkASSERT(!(rowBytes % sizeof(GrColor)));
-            GL_CALL(PixelStorei(GR_GL_PACK_ROW_LENGTH, rowBytes / sizeof(GrColor)));
+            GL_CALL(PixelStorei(GR_GL_PACK_ROW_LENGTH, 
+                                static_cast<GrGLint>(rowBytes / sizeof(GrColor))));
             readDstRowBytes = rowBytes;
         } else {
             scratch.reset(tightRowBytes * height);