Add GPU memory tab to the task manager.

content/common/gpu/gpu_memory_manager.h

Index: content/common/gpu/gpu_memory_manager.h
diff --git a/content/common/gpu/gpu_memory_manager.h b/content/common/gpu/gpu_memory_manager.h
index 1023120ee2364a6f71768ca042121a112b25505f..b9d73e0f096a07b5d90ddc1fe2955839d880ce22 100644
--- a/content/common/gpu/gpu_memory_manager.h
+++ b/content/common/gpu/gpu_memory_manager.h
@@ -7,17 +7,21 @@
 
 #if defined(ENABLE_GPU)
 
+#include <set>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/cancelable_callback.h"
 #include "base/hash_tables.h"
 #include "base/memory/weak_ptr.h"
+#include "base/process.h"
 #include "content/common/content_export.h"
 #include "content/common/gpu/gpu_memory_allocation.h"
+#include "content/public/common/gpu_info.h"
 #include "ui/gfx/size.h"
 
 class GpuCommandBufferStubBase;
+class GpuMemoryTrackingGroup;
 
 #if defined(COMPILER_GCC)
 namespace BASE_HASH_NAMESPACE {
@@ -63,6 +67,14 @@ class CONTENT_EXPORT GpuMemoryManager :
   // queued delayed manage.
   void ScheduleManage(bool immediate);
 
+  // Retrieve GPU Resource consumption statistics for the task manager
+  void GetVidmemUsageStats(
+      content::GPUVidmemUsageStats& vidmem_usage_stats) const;
+
+  // Add and remove structures to track context groups' memory consumption
+  void AddTrackingGroup(GpuMemoryTrackingGroup* tracking_group);
+  void RemoveTrackingGroup(GpuMemoryTrackingGroup* tracking_group);
+
   // Returns StubMemoryStat's for each GpuCommandBufferStubBase, which were
   // assigned during the most recent call to Manage().
   // Useful for tracking the memory-allocation-related presumed state of the
@@ -81,6 +93,9 @@ class CONTENT_EXPORT GpuMemoryManager :
 
   void Manage();
 
+  // The context groups' tracking structures
+  std::set<GpuMemoryTrackingGroup*> tracking_groups_;
+
   size_t CalculateBonusMemoryAllocationBasedOnSize(gfx::Size size) const;
 
   size_t GetAvailableGpuMemory() const {
@@ -121,6 +136,44 @@ class CONTENT_EXPORT GpuMemoryManager :
   DISALLOW_COPY_AND_ASSIGN(GpuMemoryManager);
 };
 
+// All decoders in a context group point to a single GpuMemoryTrackingGroup,
+// which tracks GPU resource consumption for the entire context group.
+class GpuMemoryTrackingGroup {
+ public:
+  GpuMemoryTrackingGroup(base::ProcessId pid, GpuMemoryManager* memory_manager)
+      : pid_(pid),
+        size_(0),
+        memory_manager_(memory_manager) {
+    memory_manager_->AddTrackingGroup(this);
+  }
+  ~GpuMemoryTrackingGroup() {
+    memory_manager_->RemoveTrackingGroup(this);
+  }
+  void TrackMemoryAllocatedChange(size_t old_size, size_t new_size) {
+    if (old_size < new_size) {
+      size_t delta = new_size - old_size;
+      size_ += delta;
+    }
+    if (new_size < old_size) {
+      size_t delta = old_size - new_size;
+      DCHECK(size_ >= delta);
+      size_ -= delta;
+    }
+    memory_manager_->TrackMemoryAllocatedChange(old_size, new_size);
+  }
+  base::ProcessId GetPid() const {
+    return pid_;
+  }
+  size_t GetSize() const {
+    return size_;
+  }
+
+ private:
+  base::ProcessId pid_;
+  size_t size_;
+  GpuMemoryManager* memory_manager_;
+};
+
 #endif
 
 #endif // CONTENT_COMMON_GPU_GPU_MEMORY_MANAGER_H_