Fixed compiler warning C4267 'conversion from 'size_t' to 'type', possible loss of data'

BUG=angleproject:1120

Change-Id: I01ef10bea7f487c2b394d030c76628f38d2ea645
Reviewed-on: https://chromium-review.googlesource.com/292780
Tested-by: Cooper Partin <coopp@microsoft.com>
Reviewed-by: Geoff Lang <geofflang@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
diff --git a/src/libANGLE/renderer/gl/RenderbufferGL.cpp b/src/libANGLE/renderer/gl/RenderbufferGL.cpp
index 416fc29..bfc2bb2 100644
--- a/src/libANGLE/renderer/gl/RenderbufferGL.cpp
+++ b/src/libANGLE/renderer/gl/RenderbufferGL.cpp
@@ -45,8 +45,8 @@
 
     nativegl::RenderbufferFormat renderbufferFormat =
         nativegl::GetRenderbufferFormat(mFunctions, mWorkarounds, internalformat);
-    mFunctions->renderbufferStorage(GL_RENDERBUFFER, renderbufferFormat.internalFormat, width,
-                                    height);
+    mFunctions->renderbufferStorage(GL_RENDERBUFFER, renderbufferFormat.internalFormat,
+                                    static_cast<GLsizei>(width), static_cast<GLsizei>(height));
 
     return gl::Error(GL_NO_ERROR);
 }
@@ -57,8 +57,9 @@
 
     nativegl::RenderbufferFormat renderbufferFormat =
         nativegl::GetRenderbufferFormat(mFunctions, mWorkarounds, internalformat);
-    mFunctions->renderbufferStorageMultisample(GL_RENDERBUFFER, samples,
-                                               renderbufferFormat.internalFormat, width, height);
+    mFunctions->renderbufferStorageMultisample(
+        GL_RENDERBUFFER, static_cast<GLsizei>(samples), renderbufferFormat.internalFormat,
+        static_cast<GLsizei>(width), static_cast<GLsizei>(height));
 
     const gl::TextureCaps &formatCaps = mTextureCaps.get(internalformat);
     if (samples > formatCaps.getMaxSamples())