Add GDB JIT support back into Android build.

runtime/vm/debuginfo_android.cc

Index: runtime/vm/debuginfo_android.cc
diff --git a/runtime/vm/debuginfo_android.cc b/runtime/vm/debuginfo_android.cc
index 4e56b3c507df38c68fb1d171a3481cc23479781c..1a11e1bb663c1715b7b39c03d238862485aa8c4c 100644
--- a/runtime/vm/debuginfo_android.cc
+++ b/runtime/vm/debuginfo_android.cc
@@ -4,31 +4,38 @@
 
 #include "vm/debuginfo.h"
 
+#include "vm/elfgen.h"
+#include "vm/gdbjit_android.h"
 
 namespace dart {
 
 DebugInfo::DebugInfo() {
-  handle_ = NULL;
+  handle_ = reinterpret_cast<void*>(new ElfGen());
+  ASSERT(handle_ != NULL);
 }
 
 
 DebugInfo::~DebugInfo() {
+  ElfGen* elf_gen = reinterpret_cast<ElfGen*>(handle_);
+  delete elf_gen;
 }
 
 
 void DebugInfo::AddCode(uword pc, intptr_t size) {
-  // Nothing to do as there is no support for this on Android.
+  ElfGen* elf_gen = reinterpret_cast<ElfGen*>(handle_);
+  elf_gen->AddCode(pc, size);
 }
 
 
 void DebugInfo::AddCodeRegion(const char* name, uword pc, intptr_t size) {
-  // Nothing to do as there is no support for this on Android.
+  ElfGen* elf_gen = reinterpret_cast<ElfGen*>(handle_);
+  elf_gen->AddCodeRegion(name, pc, size);
 }
 
 
 bool DebugInfo::WriteToMemory(ByteBuffer* region) {
-  // Nothing to do as there is no support for this on Android.
-  return false;
+  ElfGen* elf_gen = reinterpret_cast<ElfGen*>(handle_);
+  return elf_gen->WriteToMemory(region);
 }
 
 
@@ -40,12 +47,26 @@ DebugInfo* DebugInfo::NewGenerator() {
 void DebugInfo::RegisterSection(const char* name,
                                 uword entry_point,
                                 intptr_t size) {
-  // Nothing to do as there is no support for this on Android.
+  ElfGen* elf_section = new ElfGen();
+  ASSERT(elf_section != NULL);
+  elf_section->AddCode(entry_point, size);
+  elf_section->AddCodeRegion(name, entry_point, size);
+
+  ByteBuffer* dynamic_region = new ByteBuffer();
+  ASSERT(dynamic_region != NULL);
+
+  elf_section->WriteToMemory(dynamic_region);
+
+  ::addDynamicSection(reinterpret_cast<const char*>(dynamic_region->data()),
+                      dynamic_region->size());
+  dynamic_region->set_data(NULL);
+  delete dynamic_region;
+  delete elf_section;
 }
 
 
 void DebugInfo::UnregisterAllSections() {
-  // Nothing to do as there is no support for this on Android.
+  ::deleteDynamicSections();
 }
 
 }  // namespace dart