diff --git a/mozilla/layout/base/nsPresContext.cpp b/mozilla/layout/base/nsPresContext.cpp
index bdc52a9bc43..67d903fe411 100644
--- a/mozilla/layout/base/nsPresContext.cpp
+++ b/mozilla/layout/base/nsPresContext.cpp
@@ -218,6 +218,18 @@ nsPresContext::GetDefaultBackgroundColor(nscolor& aColor)
   return NS_OK;
 }
 
+NS_METHOD nsPresContext::SetDefaultColor(const nscolor& aColor)
+{
+  mDefaultColor = aColor;
+  return NS_OK;
+}
+
+NS_METHOD nsPresContext::SetDefaultBackgroundColor(const nscolor& aColor)
+{
+  mDefaultBackgroundColor = aColor;
+  return NS_OK;
+}
+
 void
 nsPresContext::GetVisibleArea(nsRect& aResult)
 {
diff --git a/mozilla/layout/base/nsPresContext.h b/mozilla/layout/base/nsPresContext.h
index 6d79c683125..98cf26dc433 100644
--- a/mozilla/layout/base/nsPresContext.h
+++ b/mozilla/layout/base/nsPresContext.h
@@ -109,6 +109,8 @@ public:
    */
   NS_IMETHOD GetDefaultColor(nscolor& aColor) = 0;
   NS_IMETHOD GetDefaultBackgroundColor(nscolor& aColor) = 0;
+  NS_IMETHOD SetDefaultColor(const nscolor& aColor) = 0;
+  NS_IMETHOD SetDefaultBackgroundColor(const nscolor& aColor) = 0;
 
   NS_IMETHOD GetImageGroup(nsIImageGroup*& aGroupResult) = 0;
 
diff --git a/mozilla/layout/base/public/nsIPresContext.h b/mozilla/layout/base/public/nsIPresContext.h
index 6d79c683125..98cf26dc433 100644
--- a/mozilla/layout/base/public/nsIPresContext.h
+++ b/mozilla/layout/base/public/nsIPresContext.h
@@ -109,6 +109,8 @@ public:
    */
   NS_IMETHOD GetDefaultColor(nscolor& aColor) = 0;
   NS_IMETHOD GetDefaultBackgroundColor(nscolor& aColor) = 0;
+  NS_IMETHOD SetDefaultColor(const nscolor& aColor) = 0;
+  NS_IMETHOD SetDefaultBackgroundColor(const nscolor& aColor) = 0;
 
   NS_IMETHOD GetImageGroup(nsIImageGroup*& aGroupResult) = 0;
 
diff --git a/mozilla/layout/base/public/nsPresContext.h b/mozilla/layout/base/public/nsPresContext.h
index 6d79c683125..98cf26dc433 100644
--- a/mozilla/layout/base/public/nsPresContext.h
+++ b/mozilla/layout/base/public/nsPresContext.h
@@ -109,6 +109,8 @@ public:
    */
   NS_IMETHOD GetDefaultColor(nscolor& aColor) = 0;
   NS_IMETHOD GetDefaultBackgroundColor(nscolor& aColor) = 0;
+  NS_IMETHOD SetDefaultColor(const nscolor& aColor) = 0;
+  NS_IMETHOD SetDefaultBackgroundColor(const nscolor& aColor) = 0;
 
   NS_IMETHOD GetImageGroup(nsIImageGroup*& aGroupResult) = 0;
 
diff --git a/mozilla/layout/base/src/nsPresContext.cpp b/mozilla/layout/base/src/nsPresContext.cpp
index bdc52a9bc43..67d903fe411 100644
--- a/mozilla/layout/base/src/nsPresContext.cpp
+++ b/mozilla/layout/base/src/nsPresContext.cpp
@@ -218,6 +218,18 @@ nsPresContext::GetDefaultBackgroundColor(nscolor& aColor)
   return NS_OK;
 }
 
+NS_METHOD nsPresContext::SetDefaultColor(const nscolor& aColor)
+{
+  mDefaultColor = aColor;
+  return NS_OK;
+}
+
+NS_METHOD nsPresContext::SetDefaultBackgroundColor(const nscolor& aColor)
+{
+  mDefaultBackgroundColor = aColor;
+  return NS_OK;
+}
+
 void
 nsPresContext::GetVisibleArea(nsRect& aResult)
 {
diff --git a/mozilla/layout/base/src/nsPresContext.h b/mozilla/layout/base/src/nsPresContext.h
index eedae203083..15351729e55 100644
--- a/mozilla/layout/base/src/nsPresContext.h
+++ b/mozilla/layout/base/src/nsPresContext.h
@@ -48,6 +48,8 @@ public:
   virtual const nsFont& GetDefaultFixedFont(void);
   NS_IMETHOD GetDefaultColor(nscolor& aColor);
   NS_IMETHOD GetDefaultBackgroundColor(nscolor& aColor);
+  NS_IMETHOD SetDefaultColor(const nscolor& aColor);
+  NS_IMETHOD SetDefaultBackgroundColor(const nscolor& aColor);
   NS_IMETHOD GetImageGroup(nsIImageGroup*& aGroupResult);
   NS_IMETHOD LoadImage(const nsString& aURL,
                        const nscolor* aBackgroundColor,