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

gpu/command_buffer/service/gles2_cmd_decoder_unittest_base.cc

Index: gpu/command_buffer/service/gles2_cmd_decoder_unittest_base.cc
diff --git a/gpu/command_buffer/service/gles2_cmd_decoder_unittest_base.cc b/gpu/command_buffer/service/gles2_cmd_decoder_unittest_base.cc
index e4dd9863f3231c6db21cf338760aafcca0007489..bbc96b4d59f9d0a9bd593fcf61515a4aaaf35645 100644
--- a/gpu/command_buffer/service/gles2_cmd_decoder_unittest_base.cc
+++ b/gpu/command_buffer/service/gles2_cmd_decoder_unittest_base.cc
@@ -2067,6 +2067,11 @@ void GLES2DecoderTestBase::SetupInitStateManualExpectations(bool es3_capable) {
   }
 }
 
+void GLES2DecoderTestBase::SetupInitStateManualExpectationsForDoLineWidth(
+    GLfloat width) {
+  EXPECT_CALL(*gl_, LineWidth(width)).Times(1).RetiresOnSaturation();
+}
+
 GLES2DecoderWithShaderTestBase::MockCommandBufferEngine::
 MockCommandBufferEngine() {
   std::unique_ptr<base::SharedMemory> shm(new base::SharedMemory());