Bug 732091 - Part 2: Add {set,get}IsFirstPaint to nsIDOMWindowUtils and nsIPresShell. r=ehsan

dom/base/nsDOMWindowUtils.cpp

@@ -388,6 +388,36 @@ nsDOMWindowUtils::SetResolution(float aXResolution, float aYResolution)
                    : NS_ERROR_FAILURE;
 }
 
+NS_IMETHODIMP
+nsDOMWindowUtils::SetIsFirstPaint(bool aIsFirstPaint)
+{
+  if (!IsUniversalXPConnectCapable()) {
+    return NS_ERROR_DOM_SECURITY_ERR;
+  }
+
+  nsIPresShell* presShell = GetPresShell();
+  if (presShell) {
+    presShell->SetIsFirstPaint(aIsFirstPaint);
+    return NS_OK;
+  }
+  return NS_ERROR_FAILURE;
+}
+
+NS_IMETHODIMP
+nsDOMWindowUtils::GetIsFirstPaint(bool *aIsFirstPaint)
+{
+  if (!IsUniversalXPConnectCapable()) {
+    return NS_ERROR_DOM_SECURITY_ERR;
+  }
+
+  nsIPresShell* presShell = GetPresShell();
+  if (presShell) {
+    *aIsFirstPaint = presShell->GetIsFirstPaint();
+    return NS_OK;
+  }
+  return NS_ERROR_FAILURE;
+}
+
 NS_IMETHODIMP
 nsDOMWindowUtils::SendMouseEvent(const nsAString& aType,
                                  float aX,

dom/interfaces/base/nsIDOMWindowUtils.idl

@@ -70,7 +70,7 @@ interface nsIDOMFile;
 interface nsIFile;
 interface nsIDOMTouch;
 
-[scriptable, uuid(73b48170-55d5-11e1-b86c-0800200c9a66)]
+[scriptable, uuid(5740d0fe-9f4e-431f-b8b3-b82f9b7ff4cf)]
 interface nsIDOMWindowUtils : nsISupports {
 
   /**
@@ -189,6 +189,15 @@ interface nsIDOMWindowUtils : nsISupports {
    */
   void setResolution(in float aXResolution, in float aYResolution);
 
+  /**
+   * Whether the next paint should be flagged as the first paint for a document.
+   * This gives a way to track the next paint that occurs after the flag is
+   * set. The flag gets cleared after the next paint.
+   *
+   * Can only be accessed with UniversalXPConnect privileges.
+   */
+  attribute boolean isFirstPaint;
+
   /** Synthesize a mouse event. The event types supported are:
    *    mousedown, mouseup, mousemove, mouseover, mouseout, contextmenu
    *

layout/base/nsIPresShell.h

@@ -1146,6 +1146,16 @@ public:
   float GetXResolution() { return mXResolution; }
   float GetYResolution() { return mYResolution; }
 
+  /**
+   * Set the isFirstPaint flag.
+   */
+  void SetIsFirstPaint(bool aIsFirstPaint) { mIsFirstPaint = aIsFirstPaint; }
+
+  /**
+   * Get the isFirstPaint flag.
+   */
+  bool GetIsFirstPaint() const { return mIsFirstPaint; }
+
   /**
    * Dispatch a mouse move event based on the most recent mouse position if
    * this PresShell is visible. This is used when the contents of the page
@@ -1261,6 +1271,8 @@ protected:
   bool                      mIsActive;
   bool                      mFrozen;
 
+  bool                      mIsFirstPaint;
+
   bool                      mObservesMutationsForPrint;
 
   bool                      mReflowScheduled; // If true, we have a reflow

layout/base/nsPresShell.cpp

@@ -823,6 +823,7 @@ PresShell::PresShell()
   mSelectionFlags = nsISelectionDisplay::DISPLAY_TEXT | nsISelectionDisplay::DISPLAY_IMAGES;
   mIsThemeSupportDisabled = false;
   mIsActive = true;
+  mIsFirstPaint = false;
   mFrozen = false;
 #ifdef DEBUG
   mPresArenaAllocCount = 0;