Add first pixel diffing test.

This is just a simple example of font scaling, so we have some
bits to diff against. I've added a /pixel directory to separate
these from the embeddertest resources.

BUG=https://code.google.com/p/pdfium/issues/detail?id=62
R=jam@chromium.org, thestig@chromium.org

Review URL: https://codereview.chromium.org/904983002

3 files changed, 134 insertions, 0 deletions

diff --git a/testing/resources/pixel/font_size.in b/testing/resources/pixel/font_size.in
new file mode 100644
index 0000000000..c4e21e2358
--- /dev/null
+++ b/testing/resources/pixel/font_size.in
@@ -0,0 +1,62 @@
+{{header}}
+{{object 1 0}} <<
+  /Type /Catalog
+  /Pages 2 0 R
+>>
+{{object 2 0}} <<
+  /Type /Pages
+  /MediaBox [ 0 0 100 400 ]
+  /Count 1
+  /Kids [ 3 0 R ]
+>>
+endobj
+{{object 3 0}} <<
+  /Type /Page
+  /Parent 2 0 R
+  /Resources <<
+    /Font <<
+      /F1 4 0 R
+    >>
+  >>
+  /Contents 6 0 R
+>>
+endobj
+{{object 4 0}} <<
+  /Type /Font
+  /Subtype /Type1
+  /BaseFont /Times-Roman
+>>
+endobj
+{{object 6 0}} <<
+>>
+stream
+BT
+20 0 Td
+0 20 Td /F1 0 Tf (Size 0) Tj
+0 20 Td /F1 1 Tf (Size 1) Tj
+0 20 Td /F1 2 Tf (Size 2) Tj
+0 20 Td /F1 3 Tf (Size 3) Tj
+0 20 Td /F1 4 Tf (Size 4) Tj
+0 20 Td /F1 5 Tf (Size 5) Tj
+0 20 Td /F1 6 Tf (Size 6) Tj
+0 20 Td /F1 7 Tf (Size 7) Tj
+0 20 Td /F1 8 Tf (Size 8) Tj
+0 20 Td /F1 9 Tf (Size 9) Tj
+0 20 Td /F1 10 Tf (Size 10) Tj
+0 20 Td /F1 11 Tf (Size 11) Tj
+0 20 Td /F1 12 Tf (Size 12) Tj
+0 20 Td /F1 13 Tf (Size 13) Tj
+0 20 Td /F1 14 Tf (Size 14) Tj
+0 20 Td /F1 15 Tf (Size 15) Tj
+0 20 Td /F1 16 Tf (Size 16) Tj
+0 20 Td /F1 17 Tf (Size 17) Tj
+0 20 Td /F1 18 Tf (Size 18) Tj
+ET
+endstream
+endobj
+{{xref}}
+trailer <<
+  /Root 1 0 R
+>>
+{{startxref}}
+%%EOF
diff --git a/testing/resources/pixel/font_size.pdf b/testing/resources/pixel/font_size.pdf
new file mode 100644
index 0000000000..e0b882b67a
--- /dev/null
+++ b/testing/resources/pixel/font_size.pdf
@@ -0,0 +1,72 @@
+%PDF-1.7
+% ò¤ô
+1 0 obj <<
+  /Type /Catalog
+  /Pages 2 0 R
+>>
+2 0 obj <<
+  /Type /Pages
+  /MediaBox [ 0 0 100 400 ]
+  /Count 1
+  /Kids [ 3 0 R ]
+>>
+endobj
+3 0 obj <<
+  /Type /Page
+  /Parent 2 0 R
+  /Resources <<
+    /Font <<
+      /F1 4 0 R
+    >>
+  >>
+  /Contents 6 0 R
+>>
+endobj
+4 0 obj <<
+  /Type /Font
+  /Subtype /Type1
+  /BaseFont /Times-Roman
+>>
+endobj
+6 0 obj <<
+>>
+stream
+BT
+20 0 Td
+0 20 Td /F1 0 Tf (Size 0) Tj
+0 20 Td /F1 1 Tf (Size 1) Tj
+0 20 Td /F1 2 Tf (Size 2) Tj
+0 20 Td /F1 3 Tf (Size 3) Tj
+0 20 Td /F1 4 Tf (Size 4) Tj
+0 20 Td /F1 5 Tf (Size 5) Tj
+0 20 Td /F1 6 Tf (Size 6) Tj
+0 20 Td /F1 7 Tf (Size 7) Tj
+0 20 Td /F1 8 Tf (Size 8) Tj
+0 20 Td /F1 9 Tf (Size 9) Tj
+0 20 Td /F1 10 Tf (Size 10) Tj
+0 20 Td /F1 11 Tf (Size 11) Tj
+0 20 Td /F1 12 Tf (Size 12) Tj
+0 20 Td /F1 13 Tf (Size 13) Tj
+0 20 Td /F1 14 Tf (Size 14) Tj
+0 20 Td /F1 15 Tf (Size 15) Tj
+0 20 Td /F1 16 Tf (Size 16) Tj
+0 20 Td /F1 17 Tf (Size 17) Tj
+0 20 Td /F1 18 Tf (Size 18) Tj
+ET
+endstream
+endobj
+xref
+0 7
+0000000000 65535 f 
+0000000015 00000 n 
+0000000061 00000 n 
+0000000154 00000 n 
+0000000280 00000 n 
+0000000000 65535 f 
+0000000358 00000 n 
+trailer <<
+  /Root 1 0 R
+>>
+startxref
+979
+%%EOF
diff --git a/testing/resources/pixel/font_size_expected.pdf.0.png b/testing/resources/pixel/font_size_expected.pdf.0.png
new file mode 100644
index 0000000000..a14df36afe
--- /dev/null
+++ b/testing/resources/pixel/font_size_expected.pdf.0.png