Add GetStubStats and related functions in GpuMemoryManager.

content/common/gpu/gpu_memory_manager.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/common/gpu/gpu_memory_manager.h"
 
 #if defined(ENABLE_GPU)
 
 #include <algorithm>
 
@@ skipping 45 matching lines @@
   }
 }
 
 }
 
 GpuMemoryManager::GpuMemoryManager(GpuMemoryManagerClient* client,
         size_t max_surfaces_with_frontbuffer_soft_limit)
     : client_(client),
       manage_immediate_scheduled_(false),
       max_surfaces_with_frontbuffer_soft_limit_(
-          max_surfaces_with_frontbuffer_soft_limit) {
+          max_surfaces_with_frontbuffer_soft_limit),
+      peak_assigned_allocation_sum_(0) {
 }
 
 GpuMemoryManager::~GpuMemoryManager() {
 }
 
 bool GpuMemoryManager::StubWithSurfaceComparator::operator()(
     GpuCommandBufferStubBase* lhs,
     GpuCommandBufferStubBase* rhs) {
   DCHECK(lhs->has_surface_state() && rhs->has_surface_state());
   const GpuCommandBufferStubBase::SurfaceState& lhs_ss = lhs->surface_state();
@@ skipping 19 matching lines @@
       return;
     delayed_manage_callback_.Reset(base::Bind(&GpuMemoryManager::Manage,
                                               AsWeakPtr()));
     MessageLoop::current()->PostDelayedTask(
       FROM_HERE,
       delayed_manage_callback_.callback(),
       base::TimeDelta::FromMilliseconds(kDelayedScheduleManageTimeoutMs));
   }
 }
 
+size_t GpuMemoryManager::GetAvailableGpuMemory() const {
+  // TODO(mmocny): Implement this with real system figures.
+  return kMaximumAllocationForTabs;
+}
+
 // The current Manage algorithm simply classifies contexts (stubs) into
 // "foreground", "background", or "hibernated" categories.
 // For each of these three categories, there are predefined memory allocation
 // limits and front/backbuffer states.
 //
 // Stubs may or may not have a surfaces, and the rules are different for each.
 //
 // The rules for categorizing contexts with a surface are:
 //  1. Foreground: All visible surfaces.
 //                 * Must have both front and back buffer.
@@ skipping 118 matching lines @@
 
   AssignMemoryAllocations(stubs_without_surface_background,
       GpuMemoryAllocation(kMinimumAllocationForTab,
           GpuMemoryAllocation::kHasNoBuffers));
 
   AssignMemoryAllocations(stubs_without_surface_hibernated,
       GpuMemoryAllocation(0, GpuMemoryAllocation::kHasNoBuffers));
 }
 
 #endif