Do bilinear interpolation for "huge" images.

Simply downsampling produces really poor renderings. Use bilinear
interpolation to make the rendering look better at the cost of being a
bit slower.

Roll DEPS for testing/corpus/ to 5a68e878 to pick up the updated test
expectations from this CL.

BUG=chromium:898443

Change-Id: Ifc5fa358a15e4674f431afcbe26e7ab70da58849
Reviewed-on: https://pdfium-review.googlesource.com/c/44651
Commit-Queue: Lei Zhang <thestig@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>

DEPS

diff --git a/DEPS b/DEPS
index 5627149..7ccb4b3 100644
--- a/DEPS
+++ b/DEPS
@@ -29,7 +29,7 @@
   'jinja2_revision': '45571de473282bd1d8b63a8dfcb1fd268d0635d2',
   'jpeg_turbo_revision': '61a2bbaa9aec89cb2c882d87ace6aba9aee49bb9',
   'markupsafe_revision': '8f45f5cfa0009d2a70589bcda0349b8cb2b72783',
-  'pdfium_tests_revision': '56802dad1a70683606dc80e3fe1d7a68cfa40869',
+  'pdfium_tests_revision': '5a68e87859476eb75d3e068bd406c4921a6be8e2',
   'skia_revision': '588f879677d4f36e16a42dd96876534f104c2e2f',
   'tools_memory_revision': 'f7b00daf4df7f6c469f5fbc68d7f40f6bd15d6e6',
   'trace_event_revision': '211b3ed9d0481b4caddbee1322321b86a483ca1f',

core/fpdfapi/render/cpdf_imagerenderer.cpp

diff --git a/core/fpdfapi/render/cpdf_imagerenderer.cpp b/core/fpdfapi/render/cpdf_imagerenderer.cpp
index 4ab3e25..ceca944 100644
--- a/core/fpdfapi/render/cpdf_imagerenderer.cpp
+++ b/core/fpdfapi/render/cpdf_imagerenderer.cpp
@@ -374,7 +374,7 @@
 
     if (image_size.ValueOrDie() > FPDF_HUGE_IMAGE_SIZE &&
         !m_ResampleOptions.bHalftone) {
-      m_ResampleOptions.bInterpolateDownsample = true;
+      m_ResampleOptions.bInterpolateBilinear = true;
     }
   }
 #ifdef _SKIA_SUPPORT_