Switch the background color in PDF Viewer when using Material Design

pdf/instance.cc

Index: pdf/instance.cc
diff --git a/pdf/instance.cc b/pdf/instance.cc
index 72b08af0b79c48d12aa4525b2adf2c374cc6e510..d34871725de6bfc8949adbe586cbb2a0438ba557 100644
--- a/pdf/instance.cc
+++ b/pdf/instance.cc
@@ -56,6 +56,8 @@ struct ToolbarButtonInfo {
   PP_ResourceImage pressed;
 };
 
+const uint32 kBackgroundColor = 0xFFCCCCCC;
+
 namespace {
 
 // Uncomment following #define to enable thumbnails.
@@ -365,6 +367,8 @@ bool Instance::Init(uint32_t argc, const char* argn[], const char* argv[]) {
 
   CreatePageIndicator(IsPrintPreviewUrl(url));
 
+  engine_->SetBackgroundColor(kBackgroundColor);
+
   if (!full_) {
     // For PDFs embedded in a frame, we don't get the data automatically like we
     // do for full-frame loads.  Start loading the data manually.