Implemented support for GL constext share groups in the renderer process.

gpu/command_buffer/common/id_allocator.cc

Index: gpu/command_buffer/common/id_allocator.cc
===================================================================
--- gpu/command_buffer/common/id_allocator.cc	(revision 95161)
+++ gpu/command_buffer/common/id_allocator.cc	(working copy)
@@ -9,6 +9,9 @@
 
 namespace gpu {
 
+IdAllocatorInterface::~IdAllocatorInterface() {
+}
+
 IdAllocator::IdAllocator() {}
 
 IdAllocator::~IdAllocator() {}
@@ -85,4 +88,34 @@
   return id;
 }
 
+NonReusedIdAllocator::NonReusedIdAllocator() : last_id_(0) {
+}
+
+NonReusedIdAllocator::~NonReusedIdAllocator() {
+}
+
+ResourceId NonReusedIdAllocator::AllocateID() {
+  return ++last_id_;
+}
+
+ResourceId NonReusedIdAllocator::AllocateIDAtOrAbove(ResourceId desired_id) {
+  if (desired_id > last_id_)
+    last_id_ = desired_id;
+
+  return ++last_id_;
+}
+
+bool NonReusedIdAllocator::MarkAsUsed(ResourceId id) {
+  GPU_NOTREACHED();
+  return false;
+}
+
+void NonReusedIdAllocator::FreeID(ResourceId id) {
+}
+
+bool NonReusedIdAllocator::InUse(ResourceId id) const {
+  GPU_NOTREACHED();
+  return false;
+}
+
 }  // namespace gpu