Reduce per-tab memory to 128M maximum, reduce default maximum across all tabs to 256M

content/common/gpu/gpu_memory_manager.h

 // 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.
 
 #ifndef CONTENT_COMMON_GPU_GPU_MEMORY_MANAGER_H_
 #define CONTENT_COMMON_GPU_GPU_MEMORY_MANAGER_H_
 
 #if defined(ENABLE_GPU)
 
 #include <vector>
@@ skipping 69 matching lines @@
   friend class GpuMemoryManagerTest;
 
   void Manage();
 
   size_t CalculateBonusMemoryAllocationBasedOnSize(gfx::Size size) const;
 
   size_t GetAvailableGpuMemory() const {
     return bytes_available_gpu_memory_;
   }
 
+  // The maximum amount of memory that a tab may be assigned
+  size_t GetMaximumTabAllocation() const {
+    return 128 * 1024 * 1024;
+  }
+
   // The minimum non-zero amount of memory that a tab may be assigned
   size_t GetMinimumTabAllocation() const {
 #if defined(OS_ANDROID)
     return 32 * 1024 * 1024;
 #else
     return 64 * 1024 * 1024;
 #endif
   }
 
   class CONTENT_EXPORT StubWithSurfaceComparator {
@@ skipping 17 matching lines @@
   // The current total memory usage, and historical maximum memory usage
   size_t bytes_allocated_current_;
   size_t bytes_allocated_historical_max_;
 
   DISALLOW_COPY_AND_ASSIGN(GpuMemoryManager);
 };
 
 #endif
 
 #endif // CONTENT_COMMON_GPU_GPU_MEMORY_MANAGER_H_