Fix VS 2015 64-bit truncation warning

gpu/gles2_conform_support/egl/egl.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <EGL/egl.h>
 #include <stdint.h>
 
 #include "base/command_line.h"
 #include "base/environment.h"
 #include "base/strings/string_split.h"
@@ skipping 108 matching lines @@
       args = base::SplitString(env_args, " ", base::TRIM_WHITESPACE,
                                base::SPLIT_WANT_NONEMPTY);
     }
     if (args.empty()) {
       args.push_back("dummy");
     }
     scoped_ptr<const char* []> argv(new const char*[args.size()]);
     for (size_t i = 0; i < args.size(); ++i) {
       argv[i] = args[i].c_str();
     }
-    base::CommandLine::Init(args.size(), argv.get());
+    base::CommandLine::Init(static_cast<int>(args.size()), argv.get());
     base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
     if (!command_line->HasSwitch(switches::kDisableGpuDriverBugWorkarounds)) {
       gpu::ApplyGpuDriverBugWorkarounds(command_line);
     }
 
     gfx::GLSurface::InitializeOneOff();
   }
 
   *major = 1;
   *minor = 4;
@@ skipping 313 matching lines @@
   return EGL_FALSE;
 }
 
 /* Now, define eglGetProcAddress using the generic function ptr. type */
 EGLAPI __eglMustCastToProperFunctionPointerType EGLAPIENTRY
 eglGetProcAddress(const char* procname) {
   return reinterpret_cast<__eglMustCastToProperFunctionPointerType>(
       gles2::GetGLFunctionPointer(procname));
 }
 }  // extern "C"