Remove ANGLE_pack_reverse_row_order.

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 95b90de2b01cae3a13c44a8b5876926575b3a209..4c7f4b25c69f22e1ea24b28ff77a19fc2f63d154 100644
--- a/gpu/command_buffer/client/gles2_implementation.cc
+++ b/gpu/command_buffer/client/gles2_implementation.cc
@@ -84,7 +84,6 @@ GLES2Implementation::GLES2Implementation(
     GpuControl* gpu_control)
     : helper_(helper),
       transfer_buffer_(transfer_buffer),
-      angle_pack_reverse_row_order_status_(kUnknownExtensionStatus),
       chromium_framebuffer_multisample_(kUnknownExtensionStatus),
       pack_alignment_(4),
       pack_row_length_(0),
@@ -96,7 +95,6 @@ GLES2Implementation::GLES2Implementation(
       unpack_skip_rows_(0),
       unpack_skip_pixels_(0),
       unpack_skip_images_(0),
-      pack_reverse_row_order_(false),
       active_texture_unit_(0),
       bound_framebuffer_(0),
       bound_read_framebuffer_(0),
@@ -445,12 +443,6 @@ bool GLES2Implementation::IsExtensionAvailableHelper(
   }
 }
 
-bool GLES2Implementation::IsAnglePackReverseRowOrderAvailable() {
-  return IsExtensionAvailableHelper(
-      "GL_ANGLE_pack_reverse_row_order",
-      &angle_pack_reverse_row_order_status_);
-}
-
 bool GLES2Implementation::IsChromiumFramebufferMultisampleAvailable() {
   return IsExtensionAvailableHelper(
       "GL_CHROMIUM_framebuffer_multisample",
@@ -1808,10 +1800,6 @@ void GLES2Implementation::PixelStorei(GLenum pname, GLint param) {
     case GL_UNPACK_SKIP_IMAGES:
       unpack_skip_images_ = param;
       return;
-    case GL_PACK_REVERSE_ROW_ORDER_ANGLE:
-      pack_reverse_row_order_ =
-          IsAnglePackReverseRowOrderAvailable() ? (param != 0) : false;
-      break;
     default:
       break;
   }
@@ -3637,25 +3625,13 @@ void GLES2Implementation::ReadPixels(
         false);
     WaitForCmd();
     if (*result != 0) {
-      // when doing a y-flip we have to iterate through top-to-bottom chunks
-      // of the dst. The service side handles reversing the rows within a
-      // chunk.
-      int8_t* rows_dst;
-      if (pack_reverse_row_order_) {
-          rows_dst = dest + (height - num_rows) * dst_padded_row_size;
-      } else {
-          rows_dst = dest;
-      }
       // We have to copy 1 row at a time to avoid writing pad bytes.
       const int8_t* src = static_cast<const int8_t*>(buffer.address());
       for (GLint yy = 0; yy < num_rows; ++yy) {
-        memcpy(rows_dst, src, unpadded_row_size);
-        rows_dst += dst_padded_row_size;
+        memcpy(dest, src, unpadded_row_size);
+        dest += dst_padded_row_size;
         src += padded_row_size;
       }
-      if (!pack_reverse_row_order_) {
-        dest = rows_dst;
-      }
     }
     // If it was not marked as successful exit.
     if (*result == 0) {
@@ -4836,10 +4812,6 @@ void GLES2Implementation::RequestExtensionCHROMIUM(const char* extension) {
   };
   const ExtensionCheck checks[] = {
     {
-      "GL_ANGLE_pack_reverse_row_order",
-      &angle_pack_reverse_row_order_status_,
-    },
-    {
       "GL_CHROMIUM_framebuffer_multisample",
        &chromium_framebuffer_multisample_,
     },