Initial version of external_oes texture support and unit test

src/gpu/gl/GrGLProgramDataManager.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 "SkMatrix.h"
 #include "gl/GrGLProgramDataManager.h"
 #include "gl/GrGLGpu.h"
@@ skipping 44 matching lines @@
         SkDEBUGCODE(
             pathProcVarying.fArrayCount = builderPathProcVarying.fVariable.getArrayCount();
             pathProcVarying.fType = builderPathProcVarying.fVariable.getType();
         );
         pathProcVarying.fLocation = builderPathProcVarying.fLocation;
     }
 }
 
 void GrGLProgramDataManager::setSampler(UniformHandle u, int texUnit) const {
     const Uniform& uni = fUniforms[u.toIndex()];
-    SkASSERT(uni.fType == kSampler2D_GrSLType);
+    SkASSERT(uni.fType == kSampler2D_GrSLType || uni.fType == kSamplerExternal_GrSLType);
     SkASSERT(GrGLSLShaderVar::kNonArray == uni.fArrayCount);
     // FIXME: We still insert a single sampler uniform for every stage. If the shader does not
     // reference the sampler then the compiler may have optimized it out. Uncomment this assert
     // once stages insert their own samplers.
     // this->printUnused(uni);
     if (kUnusedUniform != uni.fFSLocation) {
         GR_GL_CALL(fGpu->glInterface(), Uniform1i(uni.fFSLocation, texUnit));
     }
     if (kUnusedUniform != uni.fVSLocation && uni.fVSLocation != uni.fFSLocation) {
         GR_GL_CALL(fGpu->glInterface(), Uniform1i(uni.fVSLocation, texUnit));
@@ skipping 216 matching lines @@
                                                                   matrix);
 }
 
 #ifdef SK_DEBUG
 void GrGLProgramDataManager::printUnused(const Uniform& uni) const {
     if (kUnusedUniform == uni.fFSLocation && kUnusedUniform == uni.fVSLocation) {
         GrCapsDebugf(fGpu->caps(), "Unused uniform in shader\n");
     }
 }
 #endif