fix --show-composited-layer-borders on Mac

gpu/command_buffer/service/gles2_cmd_decoder.cc

Index: gpu/command_buffer/service/gles2_cmd_decoder.cc
diff --git a/gpu/command_buffer/service/gles2_cmd_decoder.cc b/gpu/command_buffer/service/gles2_cmd_decoder.cc
index a5946fab874cafdcba455ea0d5bcfa4bb081ef31..597e2732cfe8e4a28fa283fb25702bb21490d912 100644
--- a/gpu/command_buffer/service/gles2_cmd_decoder.cc
+++ b/gpu/command_buffer/service/gles2_cmd_decoder.cc
@@ -3372,6 +3372,7 @@ bool GLES2DecoderImpl::Initialize(
   viewport_max_height_ = viewport_params[1];
 
   glGetFloatv(GL_ALIASED_LINE_WIDTH_RANGE, line_width_range_);
+  state_.SetLineWidthBounds(line_width_range_[0], line_width_range_[1]);
 
   state_.scissor_width = state_.viewport_width;
   state_.scissor_height = state_.viewport_height;