Mac: Recreate browser-side GL contexts on GPU switch

content/browser/renderer_host/compositing_iosurface_context_mac.mm

Index: content/browser/renderer_host/compositing_iosurface_context_mac.mm
diff --git a/content/browser/renderer_host/compositing_iosurface_context_mac.mm b/content/browser/renderer_host/compositing_iosurface_context_mac.mm
index 95620367b0e3c74bf442be7eae6e0f51eb924050..fecab509325fd0c1f8d6cd3cb840afdf488ae973 100644
--- a/content/browser/renderer_host/compositing_iosurface_context_mac.mm
+++ b/content/browser/renderer_host/compositing_iosurface_context_mac.mm
@@ -12,6 +12,7 @@
 #include "base/debug/trace_event.h"
 #include "base/logging.h"
 #include "content/browser/renderer_host/compositing_iosurface_shader_programs_mac.h"
+#include "content/browser/gpu/gpu_data_manager_impl.h"
 #include "ui/base/ui_base_switches.h"
 #include "ui/gl/gl_switches.h"
 #include "ui/gl/gpu_switching_manager.h"
@@ -182,9 +183,13 @@ CompositingIOSurfaceContext::CompositingIOSurfaceContext(
       poisoned_(false) {
   DCHECK(window_map()->find(window_number_) == window_map()->end());
   window_map()->insert(std::make_pair(window_number_, this));
+
+  GpuDataManager::GetInstance()->AddObserver(this);
 }
 
 CompositingIOSurfaceContext::~CompositingIOSurfaceContext() {
+  GpuDataManager::GetInstance()->RemoveObserver(this);
+
   {
     gfx::ScopedCGLSetCurrentContext scoped_set_current_context(cgl_context_);
     shader_program_cache_->Reset();
@@ -206,6 +211,13 @@ NSOpenGLContext* CompositingIOSurfaceContext::nsgl_context() const {
   return nsgl_context_;
 }
 
+void CompositingIOSurfaceContext::OnGpuSwitching() {
+  // Recreate all browser-side GL contexts whenever the GPU switches. If this
+  // is not done, performance will suffer.
+  // http://crbug.com/361493
+  PoisonContextAndSharegroup();
+}
+
 // static
 CompositingIOSurfaceContext::WindowMap*
     CompositingIOSurfaceContext::window_map() {