Temporarily work around GPU process crash on Mac OS X.

chrome/gpu/gpu_info_collector_mac.mm

 // Copyright (c) 2006-2010 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 "chrome/gpu/gpu_info_collector.h"
 #include "base/sys_string_conversions.h"
 
 #import <Cocoa/Cocoa.h>
 #import <Foundation/Foundation.h>
 #import <IOKit/IOKitLib.h>
@@ skipping 37 matching lines @@
   CFTypeRef vendorIDRef = SearchPortForProperty(dspPort, CFSTR("vendor-id"));
   if (vendorID) *vendorID = IntValueOfCFData((CFDataRef)vendorIDRef);
 
   CFTypeRef deviceIDRef = SearchPortForProperty(dspPort, CFSTR("device-id"));
   if (deviceID) *deviceID = IntValueOfCFData((CFDataRef)deviceIDRef);
 
   CFReleaseIf(vendorIDRef);
   CFReleaseIf(deviceIDRef);
 }
 
+// TODO(maf): uncomment when using code below is re-enabled.
+/*
 // Return a pointer to the last character with value c in string s.
 // Returns NULL if c is not found.
 static char* FindLastChar(char *s, char c) {
   char *s_found = NULL;
 
   while (*s != '\0') {
     if (*s == c)
       s_found = s;
     s++;
   }
   return s_found;
 }
+*/
 
 
 bool CollectGraphicsInfo(GPUInfo& gpu_info) {
   int vendor_id = 0;
   int device_id = 0;
   std::wstring driver_version = L"";
   uint32 pixel_shader_version = 0u;
   uint32 vertex_shader_version = 0u;
-  uint32 gl_version;
+  uint32 gl_version = 0u;
 
   CollectVideoCardInfo(kCGDirectMainDisplay, &vendor_id, &device_id);
 
+  // TODO(maf): when this is called, there is no OpenGL context
+  // current, so calls to glGetString crash.
+  /*
   char *gl_version_string = (char*)glGetString(GL_VERSION);
   char *gl_extensions_string = (char*)glGetString(GL_EXTENSIONS);
 
   if ((gl_version_string == NULL) || (gl_extensions_string == NULL))
     return false;
 
   // Get the OpenGL version from the start of the string.
   int gl_major = 0, gl_minor = 0;
   sscanf(gl_version_string, "%u.%u",  &gl_major, &gl_minor);
 
@@ skipping 25 matching lines @@
   }
   pixel_shader_version = ((gl_hlsl_major << 16) & 0xffff0000)
                          + (gl_hlsl_minor & 0x0000ffff);
 
   // OpenGL doesn't have separate versions for pixel and vertex shader
   // languages, so set them both to the GL_SHADING_LANGUAGE_VERSION value.
   vertex_shader_version = pixel_shader_version;
 
   gl_version = ((gl_major << 16) & 0xffff0000)
                + (gl_minor & 0x0000ffff);
+  */
 
   gpu_info.SetGraphicsInfo(vendor_id, device_id, driver_version,
                            pixel_shader_version, vertex_shader_version,
                            gl_version);
   return true;
 }
 
 }  // namespace gpu_info_collector