Add libjpeg-turbo library (depends on yasm)

Mangle external function names to avoid conflict with libjpeg
Take advantage of direct color conversion (RGBA, BGRA, 565)
Prepare to use jpeg_skip_scanlines (when it is upstreamed)

BUG=skia:

Review URL: https://codereview.chromium.org/1180983002

1 files changed, 1 insertions, 1 deletions

diff --git a/dm/DM.cpp b/dm/DM.cpp
index 60929d5700..c4ea4a6f2a 100644
--- a/dm/DM.cpp
+++ b/dm/DM.cpp
@@ -209,7 +209,7 @@ static void push_codec_srcs(Path path) {
     // TODO (msarett): Add more scaling tests as we implement more flexible scaling.
     // TODO (msarett): Implement scaling tests for SkImageDecoder in order to compare with these
     //                 tests.  SkImageDecoder supports downscales by integer factors.
-    const float scales[] = { 0.125f, 0.25f, 0.5f, 1.0f };
+    const float scales[] = { 0.125f, 0.25f, 0.375f, 0.5f, 0.625f, 0.750f, 0.875f, 1.0f };
 
     for (float scale : scales) {
         // Build additional test cases for images that decode natively to non-canvas types