Free the resources used by a context group.

gpu/command_buffer/service/framebuffer_manager.cc

Index: gpu/command_buffer/service/framebuffer_manager.cc
===================================================================
--- gpu/command_buffer/service/framebuffer_manager.cc	(revision 51426)
+++ gpu/command_buffer/service/framebuffer_manager.cc	(working copy)
@@ -9,6 +9,24 @@
 namespace gpu {
 namespace gles2 {
 
+FramebufferManager::~FramebufferManager() {
+  DCHECK(framebuffer_infos_.empty());
+}
+
+void FramebufferManager::Destroy(bool have_context) {
+  while (!framebuffer_infos_.empty()) {
+    if (have_context) {
+      FramebufferInfo* info = framebuffer_infos_.begin()->second;
+      if (!info->IsDeleted()) {
+        GLuint service_id = info->service_id();
+        glDeleteFramebuffersEXT(1, &service_id);
+        info->MarkAsDeleted();
+      }
+    }
+    framebuffer_infos_.erase(framebuffer_infos_.begin());
+  }
+}
+
 void FramebufferManager::CreateFramebufferInfo(
     GLuint client_id, GLuint service_id) {
   std::pair<FramebufferInfoMap::iterator, bool> result =