Fix x64 visual studio build errors

Bug: angleproject:2740

Change-Id: I44fd2a1daf3dca764e2eef73e437feb32b36dbaa
Reviewed-on: https://chromium-review.googlesource.com/1185234
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
diff --git a/src/tests/gl_tests/MultiviewDrawTest.cpp b/src/tests/gl_tests/MultiviewDrawTest.cpp
index 6e7e3f2..7350c69 100644
--- a/src/tests/gl_tests/MultiviewDrawTest.cpp
+++ b/src/tests/gl_tests/MultiviewDrawTest.cpp
@@ -128,7 +128,8 @@
                 break;
             case GL_FRAMEBUFFER_MULTIVIEW_LAYERED_ANGLE:
                 mReadFramebuffer.resize(numLayers);
-                glGenFramebuffers(mReadFramebuffer.size(), mReadFramebuffer.data());
+                glGenFramebuffers(static_cast<GLsizei>(mReadFramebuffer.size()),
+                                  mReadFramebuffer.data());
                 for (int i = 0; i < numLayers; ++i)
                 {
                     glBindFramebuffer(GL_READ_FRAMEBUFFER, mReadFramebuffer[i]);
@@ -197,7 +198,8 @@
         }
         if (!mReadFramebuffer.empty())
         {
-            glDeleteFramebuffers(mReadFramebuffer.size(), mReadFramebuffer.data());
+            GLsizei framebufferCount = static_cast<GLsizei>(mReadFramebuffer.size());
+            glDeleteFramebuffers(framebufferCount, mReadFramebuffer.data());
             mReadFramebuffer.clear();
         }
         if (mDepthTexture)