Avoid wrong memory access due to double substitution and %%

src/gpu/gl/GrGLGpu.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #include "GrGLGpu.h"
 #include "GrGLStencilBuffer.h"
@@ skipping 123 matching lines @@
         GL_CALL_RET(renderer, GetString(GR_GL_RENDERER));
         GL_CALL_RET(version, GetString(GR_GL_VERSION));
         SkDebugf("------------------------- create GrGLGpu %p --------------\n",
                  this);
         SkDebugf("------ VENDOR %s\n", vendor);
         SkDebugf("------ RENDERER %s\n", renderer);
         SkDebugf("------ VERSION %s\n",  version);
         SkDebugf("------ EXTENSIONS\n");
         ctx.extensions().print();
         SkDebugf("\n");
-        SkDebugf(this->glCaps().dump().c_str());
+        SkDebugf("%s", this->glCaps().dump().c_str());
     }
 
     fProgramCache = SkNEW_ARGS(ProgramCache, (this));
 
     SkASSERT(this->glCaps().maxVertexAttributes() >= GrGeometryProcessor::kMaxVertexAttribs);
 
     fLastSuccessfulStencilFmtIdx = 0;
     fHWProgramID = 0;
     fTempSrcFBOID = 0;
     fTempDstFBOID = 0;
@@ skipping 2608 matching lines @@
             this->setVertexArrayID(gpu, 0);
         }
         int attrCount = gpu->glCaps().maxVertexAttributes();
         if (fDefaultVertexArrayAttribState.count() != attrCount) {
             fDefaultVertexArrayAttribState.resize(attrCount);
         }
         attribState = &fDefaultVertexArrayAttribState;
     }
     return attribState;
 }