Plumb selection bounds as a single unit

Source/web/tests/data/composited_selection_bounds_editable.html

Index: Source/web/tests/data/composited_selection_bounds_editable.html
diff --git a/Source/web/tests/data/composited_selection_bounds_editable.html b/Source/web/tests/data/composited_selection_bounds_editable.html
new file mode 100644
index 0000000000000000000000000000000000000000..532b373b697fb297399fdda2d42e23dfa586e315
--- /dev/null
+++ b/Source/web/tests/data/composited_selection_bounds_editable.html
@@ -0,0 +1,23 @@
+<style>
+    @font-face {
+        font-family: ahem;
+        src: url(Ahem.ttf);
+    }
+    * {
+        font-family: ahem;
+        margin: 0;
+        padding: 0;
+    }
+</style>
+<textarea id="text">
+    The quick brown fox jumped over the lazy dog.
+</textarea>
+<script>
+    var textNode = document.getElementById("text");
+    textNode.focus();
+
+    var expectEditable = true;
+    var expectEmptyTextFormControl = false;
+    window.expectedResult = [document, 1, 1, 1, 15, document, 1, 1, 1, 15, expectEditable, expectEmptyTextFormControl];

[jdduke (slow), 2015/03/20 20:00:15]

Any guidance on how to ensure consistent sizing across platforms? I'm getting
some off-by-one coordinates between linux and mac/win.

[yoichio, 2015/03/26 03:39:15]

It can render in different layout on each platform.
This patch is a kind of extension so you could find similar tests for
WebSelectionBound.

+</script>
+