tn's patch to apply with B2G_DUMP_PAINTING=1 to get awesome paint dumps in gecko

gistfile1.txt

    diff --git a/layout/base/nsLayoutDebugger.cpp b/layout/base/nsLayoutDebugger.cpp
    index 831b567..390edd9 100644
    --- a/layout/base/nsLayoutDebugger.cpp
    +++ b/layout/base/nsLayoutDebugger.cpp
    @@ -137,7 +137,7 @@ PrintDisplayItemTo(nsDisplayListBuilder* aBuilder, nsDisplayItem* aItem,
       }
       nsIFrame* f = aItem->Frame();
       nsAutoString fName;
    -#ifdef DEBUG
    +#ifdef DEBUG_FRAME_DUMP
       f->GetFrameName(fName);
     #endif
       bool snap;
    diff --git a/layout/base/nsLayoutUtils.cpp b/layout/base/nsLayoutUtils.cpp
    index 456ea1b..a3039f8 100644
    --- a/layout/base/nsLayoutUtils.cpp
    +++ b/layout/base/nsLayoutUtils.cpp
    @@ -2278,7 +2278,10 @@ nsLayoutUtils::PaintFrame(nsRenderingContext* aRenderingContext, nsIFrame* aFram
     
     #ifdef MOZ_DUMP_PAINTING
       FILE* savedDumpFile = gfxUtils::sDumpPaintFile;
    -  if (gfxUtils::sDumpPaintList || gfxUtils::sDumpPainting) {
    +  static uint32_t numtimes = 0;
    +  numtimes++;
    +  if (gfxUtils::sDumpPaintList || gfxUtils::sDumpPainting || numtimes % 10 == 0) {
    +    //aFrame->List(stderr, "", nsIFrame::TRAVERSE_SUBDOCUMENT_FRAMES);
         if (gfxUtils::sDumpPaintingToFile) {
           nsCString string("dump-");
           string.AppendInt(gPaintCount);
    @@ -2336,7 +2339,7 @@ nsLayoutUtils::PaintFrame(nsRenderingContext* aRenderingContext, nsIFrame* aFram
       list.PaintRoot(&builder, aRenderingContext, flags);
     
     #ifdef MOZ_DUMP_PAINTING
    -  if (gfxUtils::sDumpPaintList || gfxUtils::sDumpPainting) {
    +  if (gfxUtils::sDumpPaintList || gfxUtils::sDumpPainting || numtimes % 10 == 0) {
         if (gfxUtils::sDumpPaintingToFile) {
           fprintf_stderr(gfxUtils::sDumpPaintFile, "</script>");
         }
    diff --git a/layout/generic/nsFrameList.h b/layout/generic/nsFrameList.h
    index abe6a62..503e3b9 100644
    --- a/layout/generic/nsFrameList.h
    +++ b/layout/generic/nsFrameList.h
    @@ -14,6 +14,7 @@
     // You can also define this in a non-DEBUG build if you need frame dumps.
     #define DEBUG_FRAME_DUMP 1
     #endif
    +#define DEBUG_FRAME_DUMP 1
     
     class nsIFrame;
     class nsIPresShell;