Add webkit unit test case for ComputeTextQuads

third_party/WebKit/Source/core/editing/VisibleUnitsTest.cpp

Index: third_party/WebKit/Source/core/editing/VisibleUnitsTest.cpp
diff --git a/third_party/WebKit/Source/core/editing/VisibleUnitsTest.cpp b/third_party/WebKit/Source/core/editing/VisibleUnitsTest.cpp
index 127fdc983857351037aa2d0a3366ee6229ed8dda..a5d7f1077ba1f34b842a6838000c5de4251b4e05 100644
--- a/third_party/WebKit/Source/core/editing/VisibleUnitsTest.cpp
+++ b/third_party/WebKit/Source/core/editing/VisibleUnitsTest.cpp
@@ -1980,4 +1980,34 @@ TEST_F(VisibleUnitsTest,
   EXPECT_EQ(Position(text, 2), start);
 }
 
+TEST_F(VisibleUnitsTest, computeTextQuadDOM) {

[yosin_UTC9, 2017/05/16 10:05:07]

nit: s/compute/Compute/

+  const char* bodyContent =
+      "<p id='host'>00"

[yosin_UTC9, 2017/05/16 10:05:07]

I guess We need to have |<style>font-family: Ahem;</style>| to get same results
on all platform,
but not sure.

Let's see trybots results.

Another way is checking relation for ranges, e.g. containment, disjoint,
upper/lower, etc.

+      "<b id='one'>11111</b>"
+      "<b id='two'>22</b>"
+      "<b id='three'>33</b>"
+      "</p>";
+  SetBodyContent(bodyContent);
+
+  const Position start_position(GetDocument().getElementById("host"), 0);
+  const Position mid_position(GetDocument().getElementById("two"), 0);
+  const Position end_position(GetDocument().getElementById("three"), 0);
+  const EphemeralRange range_start_to_two(start_position, mid_position);
+  const EphemeralRange range_start_to_three(start_position, end_position);
+  Vector<FloatQuad> quads_start_to_two;
+  Vector<FloatQuad> quads_start_to_three;
+  quads_start_to_two.AppendVector(ComputeTextQuads(range_start_to_two));
+  quads_start_to_three.AppendVector(ComputeTextQuads(range_start_to_three));
+
+  EXPECT_EQ(2u, quads_start_to_two.size());
+  EXPECT_EQ(3u, quads_start_to_three.size());
+  EXPECT_EQ(quads_start_to_three[0], quads_start_to_two[0]);
+  EXPECT_EQ(quads_start_to_three[1], quads_start_to_two[1]);
+  EXPECT_EQ("8,8; 10,8; 10,9; 8,9", quads_start_to_two[0].ToString());
+  EXPECT_EQ("10,8; 15,8; 15,9; 10,9", quads_start_to_two[1].ToString());
+  EXPECT_EQ("8,8; 10,8; 10,9; 8,9", quads_start_to_three[0].ToString());
+  EXPECT_EQ("10,8; 15,8; 15,9; 10,9", quads_start_to_three[1].ToString());
+  EXPECT_EQ("15,8; 17,8; 17,9; 15,9", quads_start_to_three[2].ToString());
+}
+
 }  // namespace blink