Revert "Revert "Limit GL_TEXTURE_RECTANGLE filtering to bilinear.""

This reverts commit ce4d04ae8eace6ba53ff8b8c8d8f4a2e6af4e59f.

BUG=skia:5932

Original CL description:
>
>Limit GL_TEXTURE_RECTANGLE filtering to bilinear.
>
>Adds a clamp for GrTexture filtering that can be set by a subclass at construction. The clamping is performed by GrTextureParams. GrGLTexture limits filtering to bilinear for rectangle and external textures.
>
>Also moves samplerType() to GrTexturePriv from GrTexture.
>
>BUG=skia:5932

GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=4455

Change-Id: I4a9f4abac44979cb900f5b04fe741524eade66b1
Reviewed-on: https://skia-review.googlesource.com/4455
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
diff --git a/src/gpu/GrTexture.cpp b/src/gpu/GrTexture.cpp
index de1135a..6fc1580 100644
--- a/src/gpu/GrTexture.cpp
+++ b/src/gpu/GrTexture.cpp
@@ -70,9 +70,10 @@
 
 //////////////////////////////////////////////////////////////////////////////
 GrTexture::GrTexture(GrGpu* gpu, const GrSurfaceDesc& desc, GrSLType samplerType,
-                     bool wasMipMapDataProvided)
+                     GrTextureParams::FilterMode highestFilterMode, bool wasMipMapDataProvided)
     : INHERITED(gpu, desc)
     , fSamplerType(samplerType)
+    , fHighestFilterMode(highestFilterMode)
     // Gamma treatment is explicitly set after creation via GrTexturePriv
     , fGammaTreatment(SkSourceGammaTreatment::kIgnore) {
     if (wasMipMapDataProvided) {