libsgui: Change Rect default constructor

The current Rect default constructor initializes to all zeroes. Change
it to initialize to an invalid Rect.

Modify all of the existing invocations of the default constructor to
maintain the existing behavior.

Bug 18173359

Change-Id: Ibbad076f1550a94f56d7b1cf5350071f2022e09a
diff --git a/libs/gui/BufferQueueProducer.cpp b/libs/gui/BufferQueueProducer.cpp
index 87e5b4d..a440f6e 100644
--- a/libs/gui/BufferQueueProducer.cpp
+++ b/libs/gui/BufferQueueProducer.cpp
@@ -547,7 +547,7 @@
     int64_t timestamp;
     bool isAutoTimestamp;
     android_dataspace dataSpace;
-    Rect crop;
+    Rect crop(Rect::EMPTY_RECT);
     int scalingMode;
     uint32_t transform;
     uint32_t stickyTransform;
@@ -619,7 +619,7 @@
 
         const sp<GraphicBuffer>& graphicBuffer(mSlots[slot].mGraphicBuffer);
         Rect bufferRect(graphicBuffer->getWidth(), graphicBuffer->getHeight());
-        Rect croppedRect;
+        Rect croppedRect(Rect::EMPTY_RECT);
         crop.intersect(bufferRect, &croppedRect);
         if (croppedRect != crop) {
             BQ_LOGE("queueBuffer: crop rect is not contained within the "