Add Instant Trace Event for shader compilation in gpu which outputs shader text as attribute

src/gpu/gl/GrGLShaderBuilder.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "gl/GrGLShaderBuilder.h"
 #include "gl/GrGLProgram.h"
 #include "gl/GrGLUniformHandle.h"
@@ skipping 749 matching lines @@
                 GR_GL_CALL(gli, GetShaderInfoLog(shaderId, infoLen+1,
                                                  &length, (char*)log.get()));
                 GrPrintf(shaderSrc.c_str());
                 GrPrintf("\n%s", log.get());
             }
             SkDEBUGFAIL("Shader compilation failed!");
             GR_GL_CALL(gli, DeleteShader(shaderId));
             return 0;
         }
     }
+
+    TRACE_EVENT_INSTANT1(TRACE_DISABLED_BY_DEFAULT("skia.gpu"), "skia_gpu::GLShader",
+                         TRACE_EVENT_SCOPE_THREAD, "shader", TRACE_STR_COPY(shaderSrc.c_str()));
     if (c_PrintShaders) {
         GrPrintf(shaderSrc.c_str());
         GrPrintf("\n");
     }
 
     // Attach the shader, but defer deletion until after we have linked the program.
     // This works around a bug in the Android emulator's GLES2 wrapper which
     // will immediately delete the shader object and free its memory even though it's
     // attached to a program, which then causes glLinkProgram to fail.
     GR_GL_CALL(gli, AttachShader(programId, shaderId));
@@ skipping 316 matching lines @@
 
     GrGLPathTexGenProgramEffectsBuilder pathTexGenEffectsBuilder(this,
                                                                  effectCnt);
     this->INHERITED::createAndEmitEffects(&pathTexGenEffectsBuilder,
                                           effectStages,
                                           effectKeys,
                                           effectCnt,
                                           inOutFSColor);
     return pathTexGenEffectsBuilder.finish();
 }