Add tinted static UI resource cache

chrome/android/java/src/org/chromium/chrome/browser/compositor/layouts/Layout.java

Index: chrome/android/java/src/org/chromium/chrome/browser/compositor/layouts/Layout.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/compositor/layouts/Layout.java b/chrome/android/java/src/org/chromium/chrome/browser/compositor/layouts/Layout.java
index d1d7414cc58610c39827a50d30950593477a6abb..dd31fcf121791e97e8e6aaed97d345631fac0e53 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/compositor/layouts/Layout.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/compositor/layouts/Layout.java
@@ -150,6 +150,9 @@ public abstract class Layout implements TabContentManager.ThumbnailChangeListene
     // The next id to show when the layout is hidden, or TabBase#INVALID_TAB_ID if no change.
     private int mNextTabId = Tab.INVALID_TAB_ID;
 
+    // The last used ResourceManager.
+    private ResourceManager mResourceManager;
+
     /**
      * The {@link Layout} is not usable until sizeChanged is called.
      * This is convenient this way so we can pre-create the layout before the host is fully defined.
@@ -189,6 +192,7 @@ public abstract class Layout implements TabContentManager.ThumbnailChangeListene
      * Cleans up any internal state.  This object should not be used after this call.
      */
     public void destroy() {
+        mResourceManager = null;
     }
 
     /**
@@ -501,6 +505,7 @@ public abstract class Layout implements TabContentManager.ThumbnailChangeListene
             mNextTabId = Tab.INVALID_TAB_ID;
         }
         mUpdateHost.doneHiding();
+        if (mResourceManager != null) mResourceManager.clearTintedResourceCache();
     }
 
     /**
@@ -1173,6 +1178,9 @@ public abstract class Layout implements TabContentManager.ThumbnailChangeListene
         updateSceneLayer(viewport, contentViewport, layerTitleCache, tabContentManager,
                 resourceManager, fullscreenManager);
 
+        // Cache the current ResourceManager.
+        mResourceManager = resourceManager;

[David Trainor- moved to gerrit, 2016/08/30 19:27:32]

Would it be cleaner to add a method to the host to get the resource manager?

[mdjones, 2016/08/30 21:52:16]

Turns out mRenderHost has one.

+
         float offsetPx = fullscreenManager != null ? fullscreenManager.getControlOffset() : 0.f;
         float dpToPx = getContext().getResources().getDisplayMetrics().density;
         float offsetDp = offsetPx / dpToPx;