gpu: Upgrade DEPTH_COMPONENT16 to DEPTH_COMPONENT24 if possible

gpu/command_buffer/service/renderbuffer_manager.h

Index: gpu/command_buffer/service/renderbuffer_manager.h
diff --git a/gpu/command_buffer/service/renderbuffer_manager.h b/gpu/command_buffer/service/renderbuffer_manager.h
index 73fc2cb1974473b6b868937c3b80f52d584b88b4..707d2638d08a470b3153a20e2d2455c9faa32aed 100644
--- a/gpu/command_buffer/service/renderbuffer_manager.h
+++ b/gpu/command_buffer/service/renderbuffer_manager.h
@@ -126,7 +126,8 @@ class GPU_EXPORT RenderbufferManager {
  public:
   RenderbufferManager(MemoryTracker* memory_tracker,
                       GLint max_renderbuffer_size,
-                      GLint max_samples);
+                      GLint max_samples,
+                      bool depth24_supported);
   ~RenderbufferManager();
 
   GLint max_renderbuffer_size() const {
@@ -163,9 +164,12 @@ class GPU_EXPORT RenderbufferManager {
     return memory_tracker_->GetMemRepresented();
   }
 
-  static bool ComputeEstimatedRenderbufferSize(
-      int width, int height, int samples, int internal_format, uint32* size);
-  static GLenum InternalRenderbufferFormatToImplFormat(GLenum impl_format);
+  bool ComputeEstimatedRenderbufferSize(int width,
+                                        int height,
+                                        int samples,
+                                        int internal_format,
+                                        uint32* size) const;
+  GLenum InternalRenderbufferFormatToImplFormat(GLenum impl_format) const;
 
  private:
   friend class Renderbuffer;
@@ -177,6 +181,7 @@ class GPU_EXPORT RenderbufferManager {
 
   GLint max_renderbuffer_size_;
   GLint max_samples_;
+  bool depth24_supported_;
 
   int num_uncleared_renderbuffers_;