improvements of the FPS counter in the HUDLayer

cc/font_atlas.cc

Index: cc/font_atlas.cc
diff --git a/cc/font_atlas.cc b/cc/font_atlas.cc
index d8294da8276076af6c7872eccb2b1d2cf6babe4a..8449e9a42e3b2ee6f8ae1ff1a41e2345b3b7aec4 100644
--- a/cc/font_atlas.cc
+++ b/cc/font_atlas.cc
@@ -60,6 +60,25 @@ void FontAtlas::drawOneLineOfTextInternal(SkCanvas* canvas, const SkPaint& paint
     }
 }
 
+IntSize FontAtlas::textSize(const std::string& text)
+{
+    int maxWidth = 0;
+    std::vector<std::string> lines;
+    base::SplitString(text, '\n', &lines);
+
+    for (size_t i = 0; i < lines.size(); ++i) {
+        int lineWidth = 0;
+        for (size_t j = 0; j < lines[i].size(); ++j) {
+            int asciiIndex = (lines[i][j] < 128) ? lines[i][j] : 0;
+            lineWidth += m_asciiToRectTable[asciiIndex].width();
+        }
+        if (lineWidth > maxWidth)
+            maxWidth = lineWidth;
+    }
+
+    return IntSize(maxWidth, m_fontHeight * lines.size());
+}
+
 void FontAtlas::drawDebugAtlas(SkCanvas* canvas, const gfx::Point& destPosition) const
 {
     DCHECK(Proxy::isImplThread());