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..e097e46240dd5bb6fa5d1312fb5695e129c09cc8 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.
@@ -343,6 +345,8 @@ bool Instance::Init(uint32_t argc, const char* argn[], const char* argv[]) {
                   arraysize(kPDFNoPrintToolbarButtons));
   }
 
+  engine_->SetBackgroundColor(kBackgroundColor);
+
   CreateProgressBar();
 
   // Load autoscroll anchor image.