Defer clearing textures and renderbuffers

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 619fbf2fd4f972a18abd770bef5fd3816d07ccf1..5cd7e50cd9bc663efe54a4805e56a0ffc4820cc8 100644
--- a/gpu/command_buffer/service/renderbuffer_manager.h
+++ b/gpu/command_buffer/service/renderbuffer_manager.h
@@ -25,7 +25,7 @@ class RenderbufferManager {
 
     explicit RenderbufferInfo(GLuint service_id)
         : service_id_(service_id),
-          cleared_(false),
+          cleared_(true),
           has_been_bound_(false),
           samples_(0),
           internal_format_(GL_RGBA4),
@@ -41,10 +41,6 @@ class RenderbufferManager {
       return cleared_;
     }
 
-    void set_cleared() {
-      cleared_ = true;
-    }
-
     GLenum internal_format() const {
       return internal_format_;
     }
@@ -61,15 +57,6 @@ class RenderbufferManager {
       return height_;
     }
 
-    void SetInfo(
-        GLsizei samples, GLenum internalformat, GLsizei width, GLsizei height) {
-      samples_ = samples;
-      internal_format_ = internalformat;
-      width_ = width;
-      height_ = height;
-      cleared_ = false;
-    }
-
     bool IsDeleted() const {
       return service_id_ == 0;
     }
@@ -88,6 +75,19 @@ class RenderbufferManager {
 
     ~RenderbufferInfo() { }
 
+    void set_cleared() {
+      cleared_ = true;
+    }
+
+    void SetInfo(
+        GLsizei samples, GLenum internalformat, GLsizei width, GLsizei height) {
+      samples_ = samples;
+      internal_format_ = internalformat;
+      width_ = width;
+      height_ = height;
+      cleared_ = false;
+    }
+
     void MarkAsDeleted() {
       service_id_ = 0;
     }
@@ -123,6 +123,16 @@ class RenderbufferManager {
     return max_samples_;
   }
 
+  bool HaveUnclearedRenderbuffers() const {
+    return num_uncleared_renderbuffers_ != 0;
+  }
+
+  void SetInfo(
+      RenderbufferInfo* renderbuffer,
+      GLsizei samples, GLenum internalformat, GLsizei width, GLsizei height);
+
+  void SetCleared(RenderbufferInfo* renderbuffer);
+
   // Must call before destruction.
   void Destroy(bool have_context);
 
@@ -142,6 +152,8 @@ class RenderbufferManager {
   GLint max_renderbuffer_size_;
   GLint max_samples_;
 
+  int num_uncleared_renderbuffers_;
+
   // Info for each renderbuffer in the system.
   typedef base::hash_map<GLuint, RenderbufferInfo::Ref> RenderbufferInfoMap;
   RenderbufferInfoMap renderbuffer_infos_;