cc: Plumb gpu/sw image decode limits as layer tree settings.

cc/tiles/gpu_image_decode_controller.h

Index: cc/tiles/gpu_image_decode_controller.h
diff --git a/cc/tiles/gpu_image_decode_controller.h b/cc/tiles/gpu_image_decode_controller.h
index 26e8bd1b58e13287690a47c2e36f8cd04f842294..6a9d200a2828234bf4e7cc2c33415836faf48804 100644
--- a/cc/tiles/gpu_image_decode_controller.h
+++ b/cc/tiles/gpu_image_decode_controller.h
@@ -54,7 +54,8 @@ class CC_EXPORT GpuImageDecodeController
       public base::trace_event::MemoryDumpProvider {
  public:
   explicit GpuImageDecodeController(ContextProvider* context,
-                                    ResourceFormat decode_format);
+                                    ResourceFormat decode_format,
+                                    size_t max_gpu_image_bytes);
   ~GpuImageDecodeController() override;
 
   // ImageDecodeController overrides.
@@ -188,6 +189,7 @@ class CC_EXPORT GpuImageDecodeController
   size_t cached_items_limit_;
   size_t cached_bytes_limit_;
   size_t bytes_used_;
+  const size_t max_gpu_image_bytes_;
 
   // We can't release GPU backed SkImages without holding the context lock,
   // so we add them to this list and defer deletion until the next time the lock