Implement the new text-size-adjust CSS property

third_party/WebKit/Source/core/layout/TextAutosizer.cpp

Index: third_party/WebKit/Source/core/layout/TextAutosizer.cpp
diff --git a/third_party/WebKit/Source/core/layout/TextAutosizer.cpp b/third_party/WebKit/Source/core/layout/TextAutosizer.cpp
index 3f6ee8e3974e65d83458b685f84a00f7f0967815..a0ac433151ddabd28c37285fc99fec2b67a122f7 100644
--- a/third_party/WebKit/Source/core/layout/TextAutosizer.cpp
+++ b/third_party/WebKit/Source/core/layout/TextAutosizer.cpp
@@ -988,6 +988,13 @@ void TextAutosizer::applyMultiplier(LayoutObject* layoutObject, float multiplier
 {
     ASSERT(layoutObject);
     ComputedStyle& currentStyle = layoutObject->mutableStyleRef();
+    if (!currentStyle.getTextSizeAdjust().isAuto()) {
+        multiplier = currentStyle.getTextSizeAdjust().multiplier();
+    } else if (multiplier < 1) {

[skobes, 2016/06/27 21:37:03]

Some callers of ComputedStyle::textAutosizingMultiplier() still check multiplier
> 1:

- FontBuilder::updateComputedSize
- FontBuilder::updateAdjustedSize
- ComputedStyle::lineHeight

I think those all need to be updated?

[pdr., 2016/06/27 22:29:43]

Good catch, done.

+        // Unlike text-size-adjust, the text autosizer should only inflate fonts.
+        multiplier = 1;
+    }
+
     if (currentStyle.textAutosizingMultiplier() == multiplier)
         return;