Print error from driver when shader compiler fails

src/gpu/gl/builders/GrGLShaderStringBuilder.cpp

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrGLShaderStringBuilder.h"
 #include "gl/GrGLGpu.h"
 #include "gl/GrGLSLPrettyPrint.h"
@@ skipping 55 matching lines @@
         if (!compiled) {
             GrGLint infoLen = GR_GL_INIT_ZERO;
             GR_GL_CALL(gli, GetShaderiv(shaderId, GR_GL_INFO_LOG_LENGTH, &infoLen));
             SkAutoMalloc log(sizeof(char)*(infoLen+1)); // outside if for debugger
             if (infoLen > 0) {
                 // retrieve length even though we don't need it to workaround bug in Chromium cmd
                 // buffer param validation.
                 GrGLsizei length = GR_GL_INIT_ZERO;
                 GR_GL_CALL(gli, GetShaderInfoLog(shaderId, infoLen+1, &length, (char*)log.get()));
                 print_shader_source(strings, lengths, count);
+                SkDebugf("\n%s", (const char*)log.get());
             }
             SkDEBUGFAIL("Shader compilation failed!");
             GR_GL_CALL(gli, DeleteShader(shaderId));
             return 0;
         }
     }
 
     if (c_PrintShaders) {
         print_shader_source(strings, lengths, count);
     }
 
     // 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));
 
     return shaderId;
 }
 
 static void print_shader_source(const char** strings, int* lengths, int count) {
     const SkString& pretty = GrGLSLPrettyPrint::PrettyPrintGLSL(strings, lengths, count, true);
     SkTArray<SkString> lines;
     SkStrSplit(pretty.c_str(), "\n", &lines);
     for (const SkString& line : lines) {
         // Print the shader one line at the time so it doesn't get truncated by the adb log.
         SkDebugf("%s\n", line.c_str());
     }
 }