UseSkOnce to squelch command buffer spam

tools/gpu/gl/command_buffer/GLTestContext_command_buffer.cpp

 
 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkMutex.h"
 #include "SkOnce.h"
@@ skipping 167 matching lines @@
         configAttribs[12] = EGL_NONE;
     }
 
     initializeGLContext(nativeWindow, configAttribs, surfaceAttribs);
 }
 
 void CommandBufferGLTestContext::initializeGLContext(void *nativeWindow, const int *configAttribs,
                                                  const int *surfaceAttribs) {
     load_command_buffer_once();
     if (!gfFunctionsLoadedSuccessfully) {
-        SkDebugf("Command Buffer: Could not load EGL functions.\n");
+        static SkOnce once;
+        once([] { SkDebugf("Command Buffer: Could not load EGL functions.\n"); });
         return;
     }
 
     fDisplay = gfGetDisplay(EGL_DEFAULT_DISPLAY);
     if (EGL_NO_DISPLAY == fDisplay) {
         SkDebugf("Command Buffer: Could not create EGL display.\n");
         return;
     }
     if (!gfInitialize(fDisplay, nullptr, nullptr)) {
         SkDebugf("Command Buffer: Could not initialize EGL display.\n");
@@ skipping 128 matching lines @@
     return result;
 }
 
 int CommandBufferGLTestContext::getSampleCount() {
     EGLint result = 0;
     gfGetConfigAttrib(fDisplay, static_cast<EGLConfig>(fConfig), EGL_SAMPLES, &result);
     return result;
 }
 
 }  // namespace sk_gpu_test