Enable virtual context on IMG devices in a different way

content/gpu/gpu_info_collector_android.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 "content/gpu/gpu_info_collector.h"
 
+#include "base/command_line.h"
 #include "base/logging.h"
 #include "base/string_number_conversions.h"
 #include "base/string_piece.h"
 #include "base/string_split.h"
+#include "base/string_util.h"
+#include "content/public/common/content_switches.h"
 
 namespace {
 
 std::string GetDriverVersionFromString(const std::string& version_string) {
   // Extract driver version from the second number in a string like:
   // "OpenGL ES 2.0 V@6.0 AU@ (CL@2946718)"
 
   // Exclude first "2.0".
   size_t begin = version_string.find_first_of("0123456789");
   if (begin == std::string::npos)
@@ skipping 24 matching lines @@
 bool CollectGraphicsInfo(content::GPUInfo* gpu_info) {
   // can_lose_context must be false to enable accelerated Canvas2D
   gpu_info->can_lose_context = false;
   gpu_info->finalized = true;
   return CollectGraphicsInfoGL(gpu_info);
 }
 
 bool CollectPreliminaryGraphicsInfo(content::GPUInfo* gpu_info) {
   gpu_info->can_lose_context = false;
   // Create a short-lived context on the UI thread to collect the GL strings.
-  return CollectGraphicsInfoGL(gpu_info);
+  if (!CollectGraphicsInfoGL(gpu_info))
+    return false;
+
+  std::string vendor(StringToLowerASCII(gpu_info->gl_vendor));
+  std::string renderer(StringToLowerASCII(gpu_info->gl_renderer));
+  bool is_img = vendor.find("imagination") != std::string::npos;
+  bool is_arm = vendor.find("arm") != std::string::npos;
+  bool is_mali_t604 = is_arm && renderer.find("mali-t604") != std::string::npos;
+
+  // IMG: avoid context switching perf problems, crashes with share groups
+  // Mali-T604: http://crbug.com/154715
+  if (is_img || is_mali_t604) {
+    CommandLine::ForCurrentProcess()->AppendSwitch(
+        switches::kEnableVirtualGLContexts);
+  }
+  return true;
 }
 
 bool CollectVideoCardInfo(content::GPUInfo* gpu_info) {
   return true;
 }
 
 bool CollectDriverInfoGL(content::GPUInfo* gpu_info) {
   gpu_info->driver_version = GetDriverVersionFromString(
       gpu_info->gl_version_string);
   return true;
 }
 
 }  // namespace gpu_info_collector