Bug 1075670 - Cleanup content process widget-chrome behavior. r=smaug

Math for window chrome calculation was off on Linux. Removed redundant, and incorrect, math in favor of other better functions.

dom/base/nsFrameLoader.cpp

@@ -914,8 +914,7 @@ nsFrameLoader::ShowRemoteFrame(const nsIntSize& size,
 
     // Don't show remote iframe if we are waiting for the completion of reflow.
     if (!aFrame || !(aFrame->GetStateBits() & NS_FRAME_FIRST_REFLOW)) {
-      nsIntPoint chromeDisp = aFrame->GetChromeDisplacement();
-      mRemoteBrowser->UpdateDimensions(dimensions, size, chromeDisp);
+      mRemoteBrowser->UpdateDimensions(dimensions, size);
     }
   }
 
@@ -1960,8 +1959,7 @@ nsFrameLoader::UpdatePositionAndSize(nsSubDocumentFrame *aIFrame)
       nsIntSize size = aIFrame->GetSubdocumentSize();
       nsIntRect dimensions;
       NS_ENSURE_SUCCESS(GetWindowDimensions(dimensions), NS_ERROR_FAILURE);
-      nsIntPoint chromeDisp = aIFrame->GetChromeDisplacement();
-      mRemoteBrowser->UpdateDimensions(dimensions, size, chromeDisp);
+      mRemoteBrowser->UpdateDimensions(dimensions, size);
     }
     return NS_OK;
   }

dom/ipc/TabParent.cpp

@@ -907,8 +907,7 @@ TabParent::RecvSetDimensions(const uint32_t& aFlags,
 }
 
 void
-TabParent::UpdateDimensions(const nsIntRect& rect, const nsIntSize& size,
-                            const nsIntPoint& aChromeDisp)
+TabParent::UpdateDimensions(const nsIntRect& rect, const nsIntSize& size)
 {
   if (mIsDestroyed) {
     return;
@@ -923,9 +922,9 @@ TabParent::UpdateDimensions(const nsIntRect& rect, const nsIntSize& size,
     mRect = rect;
     mDimensions = size;
     mOrientation = orientation;
-    mChromeDisp = aChromeDisp;
 
-    unused << SendUpdateDimensions(mRect, mDimensions, mOrientation, mChromeDisp);
+    nsIntPoint chromeOffset = -GetChildProcessOffset();
+    unused << SendUpdateDimensions(mRect, mDimensions, mOrientation, chromeOffset);
   }
 }
 
@@ -2707,7 +2706,7 @@ TabParent::HandleEvent(nsIDOMEvent* aEvent)
     }
     nsIntRect windowDims;
     NS_ENSURE_SUCCESS(frameLoader->GetWindowDimensions(windowDims), NS_ERROR_FAILURE);
-    UpdateDimensions(windowDims, mDimensions, mChromeDisp);
+    UpdateDimensions(windowDims, mDimensions);
     return NS_OK;
   }
   return NS_OK;

dom/ipc/TabParent.h

@@ -247,8 +247,7 @@ public:
     // message-sending functions under a layer of indirection and
     // eating the return values
     void Show(const nsIntSize& size, bool aParentIsActive);
-    void UpdateDimensions(const nsIntRect& rect, const nsIntSize& size,
-                          const nsIntPoint& chromeDisp);
+    void UpdateDimensions(const nsIntRect& rect, const nsIntSize& size);
     void UpdateFrame(const layers::FrameMetrics& aFrameMetrics);
     void UIResolutionChanged();
     void AcknowledgeScrollUpdate(const ViewID& aScrollId, const uint32_t& aScrollGeneration);
@@ -445,7 +444,6 @@ protected:
     nsIntRect mRect;
     nsIntSize mDimensions;
     ScreenOrientation mOrientation;
-    nsIntPoint mChromeDisp;
     float mDPI;
     CSSToLayoutDeviceScale mDefaultScale;
     bool mShown;

layout/generic/nsSubDocumentFrame.cpp

@@ -1274,24 +1274,3 @@ nsSubDocumentFrame::ObtainIntrinsicSizeFrame()
   }
   return nullptr;
 }
-
-nsIntPoint
-nsSubDocumentFrame::GetChromeDisplacement()
-{
-  nsIFrame* nextFrame = nsLayoutUtils::GetCrossDocParentFrame(this);
-  if (!nextFrame) {
-    NS_WARNING("Couldn't find window chrome to calculate displacement to.");
-    return nsIntPoint();
-  }
-
-  nsIFrame* rootFrame = nextFrame;
-  while (nextFrame) {
-    rootFrame = nextFrame;
-    nextFrame = nsLayoutUtils::GetCrossDocParentFrame(rootFrame);
-  }
-
-  nsPoint offset = GetOffsetToCrossDoc(rootFrame);
-  int32_t appUnitsPerDevPixel = rootFrame->PresContext()->AppUnitsPerDevPixel();
-  return nsIntPoint((int)(offset.x/appUnitsPerDevPixel),
-                    (int)(offset.y/appUnitsPerDevPixel));
-}

layout/generic/nsSubDocumentFrame.h

@@ -127,8 +127,6 @@ public:
    */
   bool PassPointerEventsToChildren();
 
-  nsIntPoint GetChromeDisplacement();
-
 protected:
   friend class AsyncFrameInit;