Reland of relax a couple checks to allow certain non-standard PDF files.

core/fpdfapi/fpdf_parser/cpdf_parser.cpp

Index: core/fpdfapi/fpdf_parser/cpdf_parser.cpp
diff --git a/core/fpdfapi/fpdf_parser/cpdf_parser.cpp b/core/fpdfapi/fpdf_parser/cpdf_parser.cpp
index acf51de1eafcfc39c3845451a2438b78754756bf..c66647846d82d415c4cced6d96c1136da8d32e20 100644
--- a/core/fpdfapi/fpdf_parser/cpdf_parser.cpp
+++ b/core/fpdfapi/fpdf_parser/cpdf_parser.cpp
@@ -1077,8 +1077,13 @@
     FX_SAFE_UINT32 dwMaxObjNum = startnum;
     dwMaxObjNum += count;
     uint32_t dwV5Size = m_ObjectInfo.empty() ? 0 : GetLastObjNum() + 1;
-    if (!dwMaxObjNum.IsValid() || dwMaxObjNum.ValueOrDie() > dwV5Size)
+    if (!dwMaxObjNum.IsValid())
       continue;
+    // When the max object number is larger than the defined size, try to
+    // increase the size to accomodate more objects.
+    // Some software messes this up, see chromium:596947.
+    if (dwMaxObjNum.ValueOrDie() > dwV5Size)
+      ShrinkObjectMap(dwMaxObjNum.ValueOrDie());
 
     for (uint32_t j = 0; j < count; j++) {
       int32_t type = 1;