Revert "Switched highp float to highfloat and mediump float to half."

This reverts commit 88d99c63878c2d3d340120f0321676f72afcb4f0.

Reason for revert: Believed to be causing unit test failures in Chrome roll:

https://build.chromium.org/p/tryserver.chromium.android/builders/linux_android_rel_ng/builds/364433
https://luci-logdog.appspot.com/v/?s=chromium%2Fbb%2Ftryserver.chromium.android%2Flinux_android_rel_ng%2F364433%2F%2B%2Frecipes%2Fsteps%2Fcontent_browsertests__with_patch__on_Android%2F0%2Flogs%2FWebRtcCaptureFromElementBrowserTest.VerifyCanvasWebGLCaptureColor%2F0

Original change's description:
> Switched highp float to highfloat and mediump float to half.
> 
> The ultimate goal is to end up with "float" and "half", but this
> intermediate step uses "highfloat" so that it is clear if I missed a
> "float" somewhere. Once this lands, a subsequent CL will switch all
> "highfloats" back to "floats".
> 
> Bug: skia:
> Change-Id: Ia13225c7a0a0a2901e07665891c473d2500ddcca
> Reviewed-on: https://skia-review.googlesource.com/31000
> Commit-Queue: Ethan Nicholas <ethannicholas@google.com>
> Reviewed-by: Brian Salomon <bsalomon@google.com>

TBR=bsalomon@google.com,csmartdalton@google.com,ethannicholas@google.com

Change-Id: I8bfa97547ac3920d433665f161d27df3f15c83aa
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: skia:
Reviewed-on: https://skia-review.googlesource.com/35705
Commit-Queue: Brian Salomon <bsalomon@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
diff --git a/src/gpu/effects/GrBitmapTextGeoProc.cpp b/src/gpu/effects/GrBitmapTextGeoProc.cpp
index 71be7e5..a934ff1 100644
--- a/src/gpu/effects/GrBitmapTextGeoProc.cpp
+++ b/src/gpu/effects/GrBitmapTextGeoProc.cpp
@@ -34,7 +34,7 @@
         SkDEBUGCODE(GrTexture* atlas = cte.textureSampler(0).peekTexture());
         SkASSERT(atlas && SkIsPow2(atlas->width()) && SkIsPow2(atlas->height()));
 
-        GrGLSLVertToFrag v(kHighFloat2_GrSLType);
+        GrGLSLVertToFrag v(kVec2f_GrSLType);
         varyingHandler->addVarying("TextureCoords", &v, kHigh_GrSLPrecision);
         vertBuilder->codeAppendf("%s = %s;", v.vsOut(),
                                  cte.inTextureCoords()->fName);
@@ -65,12 +65,12 @@
             fragBuilder->appendTextureLookupAndModulate(args.fOutputColor,
                                                         args.fTexSamplers[0],
                                                         v.fsIn(),
-                                                        kHalf2_GrSLType);
+                                                        kVec2f_GrSLType);
             fragBuilder->codeAppend(";");
-            fragBuilder->codeAppendf("%s = half4(1);", args.fOutputCoverage);
+            fragBuilder->codeAppendf("%s = float4(1);", args.fOutputCoverage);
         } else {
             fragBuilder->codeAppendf("%s = ", args.fOutputCoverage);
-            fragBuilder->appendTextureLookup(args.fTexSamplers[0], v.fsIn(), kHalf2_GrSLType);
+            fragBuilder->appendTextureLookup(args.fTexSamplers[0], v.fsIn(), kVec2f_GrSLType);
             fragBuilder->codeAppend(";");
         }
     }