use SkFont for blob TightBounds

Bug: skia:
Change-Id: I77febaf5ab15784f1600f2f885a88dc907ae8284
Reviewed-on: https://skia-review.googlesource.com/c/176180
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Reed <reed@google.com>

Author: reed-at-google

src/core/SkTextBlob.cpp

@@ -254,21 +254,17 @@ SkTextBlobBuilder::~SkTextBlobBuilder() {
 }
 
 SkRect SkTextBlobBuilder::TightRunBounds(const SkTextBlob::RunRecord& run) {
+    const SkFont& font = run.font();
     SkRect bounds;
-    SkPaint paint;
-    run.font().LEGACY_applyToPaint(&paint);
-    paint.setTextEncoding(kGlyphID_SkTextEncoding);
 
     if (SkTextBlob::kDefault_Positioning == run.positioning()) {
-        paint.measureText(run.glyphBuffer(), run.glyphCount() * sizeof(uint16_t), &bounds);
+        font.measureText(run.glyphBuffer(), run.glyphCount() * sizeof(uint16_t),
+                         kGlyphID_SkTextEncoding, &bounds);
         return bounds.makeOffset(run.offset().x(), run.offset().y());
     }
 
     SkAutoSTArray<16, SkRect> glyphBounds(run.glyphCount());
-    paint.getTextWidths(run.glyphBuffer(),
-                        run.glyphCount() * sizeof(uint16_t),
-                        nullptr,
-                        glyphBounds.get());
+    font.getBounds(run.glyphBuffer(), run.glyphCount(), glyphBounds.get(), nullptr);
 
     SkASSERT(SkTextBlob::kFull_Positioning == run.positioning() ||
              SkTextBlob::kHorizontal_Positioning == run.positioning());