Disable broken unittests due to invalid baseline computation

This test is broken due to the way the metrics are computed
in RenderText Harfbuzz.

Assume we have a text with
  1) SUPERSCRIPT
  2) NORMAL
  3) SUBSCRIPT

The NORMAL text is using a font 12px, and the SUBSCRIPT and
SUPERSCRIPT are using a font 7 px.
The metrics of both font will differs (not the same Ascent
and Descent) and not same font-height.
The baseline offset of 1) will be negative (e.g. -3) and the
baseline offset of 2) will be positive (e.g. 3).

The test is checking that the size of the text is within a
bounding box. But the computation of that box is wrong.

The TOP is the SUPERSCRIPT baseline + superscript_font.ascent.
The BOTTOM is the SUBSCRIPT baseline - subscript_font.descent.

The current computation is trying to find the max_ascent and
max_descent and offset them on baseline. This computation
is not giving the right bounding box.

Bug: 459812
Change-Id: Id72f37888dfd2de4db2dc3b8704f06da01797cda
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1906631
Commit-Queue: Etienne Bergeron <etienneb@chromium.org>
Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Cr-Commit-Position: refs/heads/master@{#714001}

ui/gfx/render_text_unittest.cc

@@ -5770,7 +5770,7 @@ TEST_F(RenderTextTest, ZeroWidthCharacters) {
 
 // Ensure that the width reported by RenderText is sufficient for drawing. Draws
 // to a canvas and checks if any pixel beyond the bounding rectangle is colored.
-TEST_F(RenderTextTest, TextDoesntClip) {
+TEST_F(RenderTextTest, DISABLED_TextDoesntClip) {
   const char* kTestStrings[] = {
       "            ",
       // TODO(dschuyler): Underscores draw outside GetStringSize;
@@ -5850,7 +5850,7 @@ TEST_F(RenderTextTest, TextDoesntClip) {
 
 // Ensure that the text will clip to the display rect. Draws to a canvas and
 // checks whether any pixel beyond the bounding rectangle is colored.
-TEST_F(RenderTextTest, TextDoesClip) {
+TEST_F(RenderTextTest, DISABLED_TextDoesClip) {
   const char* kTestStrings[] = {"TEST", "W", "WWWW", "gAXAXWWWW"};
   const Size kCanvasSize(300, 50);
   const int kTestSize = 10;