Command Buffer: read pixels into pixel pack buffer

gpu/command_buffer/client/gles2_implementation.cc

Index: gpu/command_buffer/client/gles2_implementation.cc
diff --git a/gpu/command_buffer/client/gles2_implementation.cc b/gpu/command_buffer/client/gles2_implementation.cc
index 50b2089a59c095b14a48d549a4f1f898ed41348f..f9a54ddddc80319491b4bea6ad5a381fe4ecd293 100644
--- a/gpu/command_buffer/client/gles2_implementation.cc
+++ b/gpu/command_buffer/client/gles2_implementation.cc
@@ -3479,6 +3479,14 @@ void GLES2Implementation::ReadPixels(
     return;
   }
 
+  if (bound_pixel_pack_buffer_) {
+    GLuint offset = ToGLuint(pixels);
+    helper_->ReadPixels(
+        xoffset, yoffset, width, height, format, type, 0, offset, 0, 0, false);
+    CheckGLError();
+    return;
+  }
+
   if (bound_pixel_pack_transfer_buffer_id_) {
     GLuint offset = ToGLuint(pixels);
     BufferTracker::Buffer* buffer = GetBoundPixelUnpackTransferBufferIfValid(