Merge to M50: Fix a regression caused by 7cf13c9

BUG=591137
TBR=weili@chromium.org

Review URL: https://codereview.chromium.org/1769183002 .

(cherry picked from commit 258f19f26b3ccfc6b64429111a4a11bdc64be131)

Review URL: https://codereview.chromium.org/1869233002 .
diff --git a/core/src/fpdfapi/fpdf_render/fpdf_render_text.cpp b/core/src/fpdfapi/fpdf_render/fpdf_render_text.cpp
index 215b104..33bab91 100644
--- a/core/src/fpdfapi/fpdf_render/fpdf_render_text.cpp
+++ b/core/src/fpdfapi/fpdf_render/fpdf_render_text.cpp
@@ -319,6 +319,7 @@
   if (m_pForm->GetPageObjectList()->size() == 1 && !m_bColored) {
     auto& pPageObj = m_pForm->GetPageObjectList()->front();
     if (pPageObj->IsImage()) {
+      m_ImageMatrix = pPageObj->AsImage()->m_Matrix;
       const CFX_DIBSource* pSource =
           pPageObj->AsImage()->m_pImage->LoadDIBSource();
       if (pSource) {