const all the things

Having the glyph run list be const as it passes through the stack means
that future change can't be introduced in the device code that changes
behavior. Try to force all text changes into the SkGylphRun system.

Change-Id: I9412bc094c7adb8554887c725a6264af306e1d42
Reviewed-on: https://skia-review.googlesource.com/143702
Commit-Queue: Herb Derby <herb@google.com>
Reviewed-by: Ben Wagner <bungeman@google.com>
diff --git a/src/gpu/text/GrTextContext.cpp b/src/gpu/text/GrTextContext.cpp
index 6a34895..aeb99f1 100644
--- a/src/gpu/text/GrTextContext.cpp
+++ b/src/gpu/text/GrTextContext.cpp
@@ -86,12 +86,12 @@
 
 void GrTextContext::drawGlyphRunList(
         GrContext* context, GrTextUtils::Target* target, const GrClip& clip,
-        const SkMatrix& viewMatrix, const SkSurfaceProps& props, SkGlyphRunList* glyphRunList,
+        const SkMatrix& viewMatrix, const SkSurfaceProps& props, const SkGlyphRunList& glyphRunList,
         const SkIRect& clipBounds) {
-    SkPoint origin = glyphRunList->origin();
+    SkPoint origin = glyphRunList.origin();
 
     // Get the first paint to use as the key paint.
-    const SkPaint& skPaint = glyphRunList->paint();
+    const SkPaint& skPaint = glyphRunList.paint();
 
     // If we have been abandoned, then don't draw
     if (context->abandoned()) {
@@ -102,7 +102,7 @@
     // It might be worth caching these things, but its not clear at this time
     // TODO for animated mask filters, this will fill up our cache.  We need a safeguard here
     const SkMaskFilter* mf = skPaint.getMaskFilter();
-    bool canCache = glyphRunList->canCache() && !(skPaint.getPathEffect() ||
+    bool canCache = glyphRunList.canCache() && !(skPaint.getPathEffect() ||
                       (mf && !as_MFB(mf)->asABlur(&blurRec)));
     SkScalerContextFlags scalerContextFlags = ComputeScalerContextFlags(target->colorSpaceInfo());
 
@@ -112,7 +112,7 @@
     sk_sp<GrTextBlob> cacheBlob;
     GrTextBlob::Key key;
     if (canCache) {
-        bool hasLCD = glyphRunList->anyRunsLCD();
+        bool hasLCD = glyphRunList.anyRunsLCD();
 
         // We canonicalize all non-lcd draws to use kUnknown_SkPixelGeometry
         SkPixelGeometry pixelGeometry = hasLCD ? props.pixelGeometry() :
@@ -125,7 +125,7 @@
                                  ComputeCanonicalColor(skPaint, hasLCD);
 
         key.fPixelGeometry = pixelGeometry;
-        key.fUniqueID = glyphRunList->uniqueID();
+        key.fUniqueID = glyphRunList.uniqueID();
         key.fStyle = skPaint.getStyle();
         key.fHasBlur = SkToBool(mf);
         key.fCanonicalColor = canonicalColor;
@@ -148,8 +148,8 @@
             textBlobCache->makeMRU(cacheBlob.get());
 
             if (CACHE_SANITY_CHECK) {
-                int glyphCount = glyphRunList->totalGlyphCount();
-                int runCount = glyphRunList->runCount();
+                int glyphCount = glyphRunList.totalGlyphCount();
+                int runCount = glyphRunList.runCount();
                 sk_sp<GrTextBlob> sanityBlob(textBlobCache->makeBlob(glyphCount, runCount));
                 sanityBlob->setupKey(key, blurRec, skPaint);
                 this->regenerateGlyphRunList(
@@ -180,8 +180,8 @@
                                        SkScalerContextFlags scalerContextFlags,
                                        const SkMatrix& viewMatrix,
                                        const SkSurfaceProps& props,
-                                       SkGlyphRunList* glyphRunList) const {
-    SkPoint origin = glyphRunList->origin();
+                                       const SkGlyphRunList& glyphRunList) const {
+    SkPoint origin = glyphRunList.origin();
     cacheBlob->initReusableBlob(paint.luminanceColor(), viewMatrix, origin.x(), origin.y());
 
     // Regenerate textblob
@@ -718,8 +718,8 @@
     sk_sp<GrTextBlob> blob;
 
     auto glyphRunList = builder.useGlyphRunList();
-    if (!glyphRunList->empty()) {
-        auto glyphRun = (*glyphRunList)[0];
+    if (!glyphRunList.empty()) {
+        auto glyphRun = glyphRunList[0];
         // Use the text and textLen below, because we don't want to mess with the paint.
         glyphRun.temporaryShuntToCallback(
             [&](size_t runSize, const char* glyphIDs, const SkScalar* pos) {