On gpu, use max(r,g,b) for coverage alpha in LCD and update lcd blend gm.

src/gpu/effects/GrBitmapTextGeoProc.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrBitmapTextGeoProc.h"
 #include "GrInvariantOutput.h"
 #include "GrTexture.h"
@@ skipping 51 matching lines @@
             fsBuilder->appendTextureLookupAndModulate(args.fOutputColor,
                                                       args.fSamplers[0],
                                                       v.fsIn(),
                                                       kVec2f_GrSLType);
             fsBuilder->codeAppend(";");
             fsBuilder->codeAppendf("%s = vec4(1);", args.fOutputCoverage);
         } else {
             fsBuilder->codeAppendf("%s = ", args.fOutputCoverage);
             fsBuilder->appendTextureLookup(args.fSamplers[0], v.fsIn(), kVec2f_GrSLType);
             fsBuilder->codeAppend(";");
+            if (cte.maskFormat() == kA565_GrMaskFormat) {
+                // set alpha to be max of rgb coverage
+                fsBuilder->codeAppendf("%s.a = max(max(%s.r, %s.g), %s.b);",
+                                       args.fOutputCoverage, args.fOutputCoverage,
+                                       args.fOutputCoverage, args.fOutputCoverage);
+            }
         }
     }
 
     void setData(const GrGLProgramDataManager& pdman, const GrPrimitiveProcessor& gp) override {
         const GrBitmapTextGeoProc& btgp = gp.cast<GrBitmapTextGeoProc>();
         if (btgp.color() != fColor && !btgp.hasVertexColor()) {
             GrGLfloat c[4];
             GrColorToRGBAFloat(btgp.color(), c);
             pdman.set4fv(fColorUniform, 1, c);
             fColor = btgp.color();
@@ skipping 94 matching lines @@
             break;
         case 2:
             format = kARGB_GrMaskFormat;
             break;
     }
 
     return GrBitmapTextGeoProc::Create(GrRandomColor(d->fRandom), d->fTextures[texIdx], params,
                                        format, GrTest::TestMatrix(d->fRandom),
                                        d->fRandom->nextBool());
 }