PDF: Tweak font-size and colors to more closely match other MD WebUI

chrome/browser/resources/pdf/elements/shared-vars.html

Index: chrome/browser/resources/pdf/elements/shared-vars.html
diff --git a/chrome/browser/resources/pdf/elements/shared-vars.html b/chrome/browser/resources/pdf/elements/shared-vars.html
new file mode 100644
index 0000000000000000000000000000000000000000..f67f2b48af2c460ce87bab24ccc65ae34e21d461
--- /dev/null
+++ b/chrome/browser/resources/pdf/elements/shared-vars.html
@@ -0,0 +1,16 @@
+<link rel="import" href="chrome://resources/polymer/v1_0/paper-styles/color.html">
+
+<style is="custom-style">
+  html {
+    --primary-text-color: var(--paper-grey-900);
+    --iron-icon-height: 20px;
+    --iron-icon-width: 20px;
+    --paper-icon-button: {
+      height: 32px;
+      padding: 6px;
+      width: 32px;
+    };
+    --paper-icon-button-ink-color: rgb(189, 189, 189);
+    --viewer-icon-ink-color: rgb(189, 189, 189);
+  }
+</style>