Allow max tile size to be overridden separately from max texture size.

src/gpu/GrCaps.cpp

Index: src/gpu/GrCaps.cpp
diff --git a/src/gpu/GrCaps.cpp b/src/gpu/GrCaps.cpp
index 4095f1ab10e016404d02d894513b2113b97535ed..75cecdfb8c0b8d00111b2f3ed37e0be9fae0dcbd 100644
--- a/src/gpu/GrCaps.cpp
+++ b/src/gpu/GrCaps.cpp
@@ -121,6 +121,12 @@ GrCaps::GrCaps(const GrContextOptions& options) {
 
 void GrCaps::applyOptionsOverrides(const GrContextOptions& options) {
     fMaxTextureSize = SkTMin(fMaxTextureSize, options.fMaxTextureSizeOverride);
+    // If the max tile override is zero, it means we should use the max texture size.
+    if (!options.fMaxTileSizeOverride || options.fMaxTileSizeOverride > fMaxTextureSize) {
+        fMaxTileSize = fMaxTextureSize;
+    } else {

[robertphillips, 2015/11/02 18:37:57]

Should we power of two this?

[bsalomon, 2015/11/02 19:06:49]

why?

+        fMaxTileSize = options.fMaxTileSizeOverride;
+    }
 }
 
 static SkString map_flags_to_string(uint32_t flags) {