Handle UNPACK_SKIP_* and PACK_SKIP_* parameters on the client side.

gpu/command_buffer/service/context_state.cc

Index: gpu/command_buffer/service/context_state.cc
diff --git a/gpu/command_buffer/service/context_state.cc b/gpu/command_buffer/service/context_state.cc
index a430d1d8bcb0de3000f0cb09eb79c99a6e4b4412..85cde3bfab3297f1782f67c74860de1c61d7c6cf 100644
--- a/gpu/command_buffer/service/context_state.cc
+++ b/gpu/command_buffer/service/context_state.cc
@@ -461,15 +461,9 @@ void ContextState::UpdateUnpackParameters() const {
   if (bound_pixel_unpack_buffer.get()) {
     glPixelStorei(GL_UNPACK_ROW_LENGTH, unpack_row_length);
     glPixelStorei(GL_UNPACK_IMAGE_HEIGHT, unpack_image_height);
-    glPixelStorei(GL_UNPACK_SKIP_PIXELS, unpack_skip_pixels);
-    glPixelStorei(GL_UNPACK_SKIP_ROWS, unpack_skip_rows);
-    glPixelStorei(GL_UNPACK_SKIP_IMAGES, unpack_skip_images);
   } else {
     glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
     glPixelStorei(GL_UNPACK_IMAGE_HEIGHT, 0);
-    glPixelStorei(GL_UNPACK_SKIP_PIXELS, 0);
-    glPixelStorei(GL_UNPACK_SKIP_ROWS, 0);
-    glPixelStorei(GL_UNPACK_SKIP_IMAGES, 0);
   }
 }
 
@@ -599,23 +593,23 @@ void ContextState::UnbindSampler(Sampler* sampler) {
 }
 
 PixelStoreParams ContextState::GetPackParams() {
+  DCHECK_EQ(0, pack_skip_pixels);
+  DCHECK_EQ(0, pack_skip_rows);
   PixelStoreParams params;
   params.alignment = pack_alignment;
   params.row_length = pack_row_length;
-  params.skip_pixels = pack_skip_pixels;
-  params.skip_rows = pack_skip_rows;
   return params;
 }
 
 PixelStoreParams ContextState::GetUnpackParams(Dimension dimension) {
+  DCHECK_EQ(0, unpack_skip_pixels);
+  DCHECK_EQ(0, unpack_skip_rows);
+  DCHECK_EQ(0, unpack_skip_images);
   PixelStoreParams params;
   params.alignment = unpack_alignment;
   params.row_length = unpack_row_length;
-  params.skip_pixels = unpack_skip_pixels;
-  params.skip_rows = unpack_skip_rows;
   if (dimension == k3D) {
     params.image_height = unpack_image_height;
-    params.skip_images = unpack_skip_images;
   }
   return params;
 }