add script to count glyph -vs- char draw calls

git-svn-id: http://skia.googlecode.com/svn/trunk@9548 2bbb7eff-a529-9590-31e7-b0007b416f81

tools/lua/chars-vs-glyphs.lua

@@ -0,0 +1,35 @@
+local canvas
+
+function sk_scrape_startcanvas(c, fileName)
+    canvas = c
+end
+
+function sk_scrape_endcanvas(c, fileName)
+    canvas = nil
+end
+
+local glyph_calls = 0
+local unichar_calls = 0
+
+local isTextVerbs = {
+    drawPosText = true,
+    drawPosTextH = true,
+    drawText = true,
+    drawTextOnPath = true,
+}
+
+function sk_scrape_accumulate(t)
+    if isTextVerbs[t.verb] then
+        if t.glyphs then
+            glyph_calls = glyph_calls + 1
+        else
+            unichar_calls = unichar_calls + 1
+        end
+    end
+end
+
+function sk_scrape_summarize()
+    io.write("glyph calls = ", glyph_calls,
+             ", unichar calls = ", unichar_calls, "\n");
+end
+